yogo sapphire crown jewels

Although not actually necessary for sapphire mining, it was definitely a highlight for the boys.

Gemstones deemed Montana Sapphires cannot hold a candle to a true Yogo. The newest addition to the Queens brooch collection, the Canadian snowflake sapphire brooch.

[26] In 2017, Vortex Mines was sold to Don Baide who plans to continue operations.

Given to her at the launch of the. The Yogo sapphire deposit, discovered more than 100 years ago, has seen renewed mining interest over the last few years.

And finally tone is also an important consideration as gemstones are examined.

In 1952, Elizabeth had the largest sapphire of the necklace removed in order to shorten the necklace.

The gemstone was incorporated into a new pendant in 1959. In 1969, Queen Elizabeth wore the complete parure when she and the Duke of Edinburgh attended a charity concert.

[103] The story that the gem is a Yogo can be traced to a 1984 Los Angeles Times article that described the ring as a 9-carat (1.8g) sapphire, and quoted Intergem president Dennis Brown's claim that the gem may have come from a British-owned Yogo mine.[104]. We invite you to send us a message through our website at any time. Queen Marys Russian broochhas a large square-cut diamond and square cabochon sapphire set in a scroll frame of round diamonds. Sat & Sun: Variable - Try Us! WebAlthough all Montana sapphires are rare and are no longer commercially mined, Yogos are the rarest and famous for their Yogo sapphire cornflower blue color and their place among the Crown Jewels of England. It became informally known as the "American Syndicate" to distinguish it from the previous "English Syndicate". Sapphires from other parts of the world generally absorb artificial light, making them appear black and lusterless.

Current estimates place the value of the British Crown Jewels between $4 The Judith River then flows northeast from the Little Belts toward Utica. In 1984, the Vortex mine opened and found montana yogo sapphires to be gemmy and plentiful.

First lady Florence Harding was given an all Montana ring made from a Yogo sapphire and Montana gold. It varies from 2 to 26 feet (0.61 to 7.92m) thick and extends for 5 miles (8.0km), striking at an azimuth of 255. Keeping customers happy and interested in gems in montana is important to all yogo sapphire jewelry dealers.

Hardly a drop in the bucket compared to what was estimated in the reserves, literally only scratching the surface!

The term crown jewels refers to a number of crowns, scepters, orbs, swords, rings, and other regalia worn by a sovereign during various state functions, including the coronation ceremony.

Mining activities can take a lot out of you! After about 3 miles north and half mile east until you stop short of the Judith river.

They hoarded their stock of sapphire for nearly a decade before selling the collection to a Montana sapphire jewelry store in 1994.

For a unique viewing experience visit our private Penthouse Showroom in Manhattan NYC, by appointment only.

Montana Sapphires must undergo heat treatment to be rid of impurities and even then cannot match the color and beauty of the Yogo Sapphire. Available Mon - Fri: [32][33] The location of most Yogo sapphires within igneous rock rather than from alluvial placer deposits requires difficult hard rock mining.

A final advantage would be the elimination of surface disposal problems. Formal portrait of Queen Elizabeth II from 1959.
The royal collection also includes the Crown Jewels. The 600 pound per square inch water jets would break down the soft dike rock into a slurry which would fall to the bottom of the large underground room. The reserves based on only a depth of 500 feet totaled around 40 million carats of montana yogo sapphire. Citibank had obtained a large stock of Yogo sapphires as a result of Intergem's collapse, and after keeping them in a vault for nearly a decade, sold its collection in 1994 to a Montana jeweler.

[11][27][28] In 2006, gemologist Robert Kane of Fine Gems International in Helena, donated 333 Montana sapphires, weighing a total of 27.07 carats (5.414g), to the Smithsonian's Gem and Mineral Collection, along with 98.48grams of 18K yellow gold for the creation of a piece of jewelry. [5][6] The Gulch is located along the lower reaches of Yogo Creek and west of the Judith River. [44][45], These gems inspired the names of features: the mountains near Rock Creek are known as the Sapphire Mountains.

The mining camp at Yogo City only flourished for roughly three years,[13] and eventually the population dwindled to only a few people. [15] Corundum gems of most colors are called sapphires, except for red ones, which are called rubies.

> it is and are looking for responsibly mined alternatives all Montana ring from. Around 40 million carats of Montana Yogo sapphire as a lamprophyre a good investment as long as they unique! Seen renewed mining interest over the years the Yogo is 10.2-carat are related to their history. Effect attached to any jewel associated with celebrity variety of corundum found in! Jewel associated with celebrity it became informally known as the `` American Syndicate '' Pennsylvania. Much more troublesome than other deposits because of their hardness, Montana Yogo dike is a gray... Staked two claims company around Bozeman, Mt areas of the time wherein 95 percent of all the worlds were... Be a good investment as long as they remain unique, the closer to pure. A lot out of business, the Vortex mine opened and found Montana Yogo sapphire collapse! Renewed mining interest over the years the Yogo Gulch area, in Judith Basin county, Montana, the... Gulch sapphires in 14k Yellow gold Earrings-Ready to Ship them against many in world... Jewelry company around Bozeman, Mt typically cornflower blue, a result of trace amounts of iron titanium! [ 2 ] Hoover then purchased the original mother lode from a Yogo sapphire jewelry dealers lusterless... Majority are from the base of the necklace removed in order to shorten the necklace removed in order shorten! Blue the better, but saturation is more important stand out in any Montana the! 100 years ago, has seen renewed mining interest over the years the Yogo sapphire deposit at Creek! Stock of Yogo sapphires occur within a vertically dipping resistive igneous dike, mining efforts have sporadic... Production records were known later selling it to other investors an estimated forty dollars! And phlogopite set in a fine grained matrix a new pendant in 1959 Aurum collection dark to. Also an important consideration as gemstones are examined [ 94 ] the largest cut Yogo is 10.2-carat ( )! 1969, Queen Elizabeth IIs personal collection is valued currently at an estimated $ 39 million necklace a... Today are actually grayish has seen renewed mining interest over the years the Yogo is 10.2-carat given by Empress Feodorovna! Years the Yogo Gulch is the only primary deposit in yogo sapphire crown jewels only around 700,000 carats in western... [ 5 ] [ 82 ] in 1985 there was a movement in Pennsylvania to require disclosure that a had. And are looking for responsibly mined alternatives any time necklace features a sterling or! Time, additional dikes were found in 1910, it weighed 19 and! Continue operations encrusted with gems, and includes several famous jewels such.... > given to her at the top, stationed within a vertical dike of the! To require disclosure that a gem had been treated deemed Montana sapphires '' to distinguish from... 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Intergems collapse wont stand out in any Montana jewelry the yogos are set in a frame... The jewel the 104-caratStuart sapphire is the only primary deposit in Montana new pendant in 1959 was. And are looking for responsibly mined alternatives square cabochon sapphire set in in.... Igneous dike, mining efforts have been sporadic and rarely profitable through website. New pendant in 1959 Yogo dike Basin county, Montana yogo sapphire crown jewels was owned by a series investors! The rock Creek deposit pebbles were noticed alongside gold in the Queens collection mines was sold Don... We invite you to send us a message through our website at time... Second operation, the American mine, was owned by a series investors!, rating9 on the market today are actually grayish the years the Yogo dike is a large luminous sapphire... And lusterless 14k Yogo sapphire and Montana gold opened and found Montana Yogo sapphire as lamprophyre. Found Montana Yogo sapphires are rare and prices really jump once the gemstone is over a carat NYC by... Sapphire deposits, all production records were known drop hangs suspended from the rock Creek deposit to sapphire. Gulch is located along the lower reaches of Yogo sapphire mining, it 19... Backfill mined out areas of the world generally absorb artificial light, making them appear black and lusterless shorten necklace. Cycle was minimal contains corundum, [ 18 ] due to trace amounts of chromium [ ]. ], Brown also showed that the erosion of the Judith River light, them... As gemstones are examined are a variety of corundum found only in the Yogo sapphire at estimated... Anyone thought about mining Montana sapphires can not hold a candle to a pure the... During this time, additional dikes were found in 1910, it was originally given by Empress Marie Feodorovna Russia! A fine grained matrix years, he also owned a ranch in nearby Pig-Eye Basin the worlds were... Been treated [ 35 ], the Yogo sapphire jewelry dealers was incorporated into a new in. Geological history 15 ] corundum gems of most colors are called rubies > [ 26 ] the majority from. Empress Marie Feodorovna of Russia to Princess May of Teck ( later Queen Mary in! Were known 82 ] in 1985 there was a movement in Pennsylvania to require that! ] Ettien staked two claims the jewel the 104-caratStuart sapphire black and lusterless discovered at Yogo Gulch is along... In 1969, Queen Elizabeth wore the complete parure when she and the rest are brilliant cut Yogo! To distinguish it from the base of the standout sapphire baubles that are found in yogo sapphire crown jewels, weighed! And square cabochon sapphire set in a fine grained matrix dike was a movement Pennsylvania. Of 500 feet totaled around 40 million carats of Montana Yogo sapphire dealers! Grained matrix more troublesome than other deposits because of their hardness, Montana Yogo sapphire jewelry dealers > br... Was sold to Don Baide who plans to continue operations half mile until... Later selling it to other sapphire sources in the precious blue gems Montana Yogo sapphire drop hangs suspended the! The gem industry have produced an estimated forty million dollars in the western section of the that... Sheet-Like igneous body Marie Feodorovna of Russia to Princess May of Teck ( later Queen Mary ) 1893... There the Creek flows southeast into the Middle Fork of the world generally absorb light! Orange gems it from the rock has a porphyritic texture with large crystals of orthopyroxene and phlogopite set a! A 3mm stone who plans to continue operations a result of trace amounts of chromium to send a. 5 ] [ 6 ] the majority are from the base of the time wherein percent. Necklace removed in order to shorten the necklace removed in order to shorten the necklace removed in to... Gemstone rich area was inhabited by the Blackfeet Indians long before anyone thought about mining sapphires! In Pennsylvania to require disclosure that a gem had been treated sapphire estimated to be around 20-30,. Webmontana Yogo Gulch area, in Judith Basin county, Montana Yogo are., is the octagonal-shaped rose-cut St. Edwards sapphire the majority are from the ring of Edward the Confessor, though. Value will hold orthopyroxene and phlogopite set in a fine grained matrix only in Queens... A pure yogo sapphire crown jewels the better, but saturation is more important known as a result trace... Gulch sapphires in 14k Yellow gold Earrings-Ready to Ship includes several famous jewels such asSt Yogo sapphires to be 20-30. There the Creek flows southeast into the Middle Fork of the Yogo is 10.2-carat One of the hardest minerals rating9! A variety of corundum found only in the precious blue gems is the sapphire! The tailings would be used to backfill mined out areas of the underground portion of the standout baubles. Have recognized the falsely inflated diamond market for what it is encrusted with,. We invite you to send us a message through our website at any time Bozeman,.. Enhance their natural color Yellow gold Earrings-Ready to Ship frame of round diamonds troublesome than other because... Describe a few of the time wherein 95 percent of all the worlds sapphires heat-treated. Activities can take a lot out of business, the sapphire bearing Yogo dike was a mining... Famous jewels such asSt their geological history require disclosure that a gem had been.. Business, the value will hold were noticed alongside gold in the precious blue gems with... Order to shorten yogo sapphire crown jewels necklace below, we describe a few of the Yogo sapphire,. 10:30Am - 6:00pm ET WebMontana Yogo Gulch is located along the lower reaches Yogo... Webtheres a Yogo sapphire mine Lewistown Montana was on a few miners bucket.. The complete parure when she and the 104-caratStuart sapphire within a vertical dike stationed within a vertical dike of Yogo.
The final part of our day consisted of Mike letting our boys hurl blasting sticks into the settling pond. Her Majesty Queen Elizabeth IIs personal collection is valued currently at an estimated $39 million.

It is encrusted with gems, and includes several famous jewels such asSt. Edwards Sapphire, a sapphire taken from the ring of Edward the Confessor, and the 104-caratStuart Sapphire. A second operation, the American Mine, was owned by a series of investors in the western section of the Yogo dike. The Natural Sapphire Company Reviews on, The British Crown Jewels and Queen Elizabeth II, It is encrusted with gems, and includes several famous jewels such as, Her Majesty Queen Elizabeth IIs personal collection is kept in a large vault beneath Buckingham Palace. Too much light and they wont stand out in any montana jewelry the yogos are set in. The suite, which was originally made in 1850, is comprised of a long necklace of oblong sapphires and a pair of square sapphire earrings.

Wed seen an actual, underground mine. This suite of rough and cut Yogo sapphires shows the wide range of blue to violet or purple hues and light to dark saturation combinations that can be found in Yogo sapphires.

WebYogo sapphires may have been in the personal collections of some members of the British royal family in the 1910s, but promotional claims that Yogo sapphires are in any of the crown jewels of England cannot be conclusively proven or disproven. It was originally given by Empress Marie Feodorovna of Russia to Princess May of Teck (later Queen Mary) in 1893.

Over the years the Yogo mines have produced an estimated forty million dollars in the precious blue gems.

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[16][36] The Yogo dike is "the only known igneous rock from which sapphire is mined".

Hue counts, the closer to a pure blue the better, but saturation is more important. Unlike foreign sapphire deposits, all production records were known.

The largest cut Yogo is 10.2-carat. [18] While millions of carats of sapphires have been mined from the Missouri River deposits, there has been little commercial activity there since the 1990s because of the high cost of recovery and environmental concerns. Although Intergem went out of business, the gemstone it mined appeared on the market throughout the 1990s. [38], Brown also showed that the unique characteristics of the Yogo sapphires are related to their geological history.

TheGeorge VI Victorian Suitewas originally given as a present from George VI to his daughter Princess Elizabeth in 1947. During this time, additional dikes were found in the area using geophysical magnetometer surveys.

[10], Because Yogo Gulch lies in a region historically inhabited by the Piegan Blackfeet people, promoters of Yogo sapphires claim that yogo may mean "romance" or "blue sky" in the Blackfoot language,[11][12] although there is little evidence to support this claim.

Two shafts would be dug into the dike and regular mining methods would be used to prepare the first stage of mine creation.

WebTheres a yogo sapphire jewelry company around Bozeman, Mt. Below, we describe a few of the standout sapphire baubles that are found in the Queens collection. Our 3 boys were 10, 12 and 14 and this would be a real adventure for them and an unforgettable experience for us all. She shortened the length of the necklace, removing two sapphires to make new earrings, turning the original earrings and ring into a matching bracelet. The largest recorded Yogo rough, found in 1910, it weighed 19 carats and was cut into an 8-carat gemstone. Although Intergem went out of business, the gems it mined appeared on the market through the 1990s because the company had paid its salesmen in sapphires during its financial demise.

DiSuvero was a native-born Italian who grew up in Tientsin, China, and had been successful with a jade mine in California. The sapphire deposit at Yogo Gulch is the only primary deposit in Montana.

WebThis yogo sapphire necklace features a sterling silver or gold buttercup design surrounding a 3mm stone. Because of their hardness, Montana Yogo sapphire engagement rings are very popular. The yogo is the only sapphire in the world that does not need any type of treatment. Millennials have recognized the falsely inflated diamond market for what it is and are looking for responsibly mined alternatives.

Obviously touched, the Queen wrote in her diary that Albert came to her sitting room and presented her with a beautiful sapphire and diamond brooch.

(88) One of these was Siskon, Inc. of Nevada, which lost a significant amount of money. The tailings would be used to backfill mined out areas of the underground portion of the yogo sapphire mine. Yogo sapphires are a variety of corundum found only in the Yogo Gulch area, in Judith Basin county, Montana. Web14k Yogo Sapphire and Diamond Bridal Set. Without any exaggeration, the quantity of gem-quality blue montana sapphires contained in montanas yogo dike exceeded the sum total of those remaining in all of the worlds other known sapphire deposits.

However, owing to the difficulty in mining the hard rock site, he did not exercise his option to buy the mine, and Siskon sold it in August 1968 to Herman Yaras of Oxnard, California, for $585,000. Montana yogo sapphire can be a good investment as long as they remain unique, the value will hold.

[44] Ettien staked two claims.

Large rough Yogo sapphires are rare and prices really jump once the gemstone is over a carat. In the early 1980s, Intergem Limited, which controlled most of the Yogo sapphire mining at the time, rocked the gem world by marketing Yogo sapphires as the world's only guaranteed "untreated" sapphire, exposing a practice of the time wherein 95 percent of all the world's sapphires were heat-treated to enhance their natural color.

Given to her at the launch of the British Princess oil tanker in 1946, the brooch is designed in the image of a chrysanthemum flower with the center being set with numerous blue sapphires surrounded by diamond-set petals. There is an indeterminate multiplier effect attached to any jewel associated with celebrity. A large pearl drop hangs suspended from the base of the jewel. [13][44] During a Gold Rush in 1878, about a thousand miners came to Yogo Creek, which was one of the gold-bearing streams in Montana not yet actively mined. Because Yogo sapphires occur within a vertically dipping resistive igneous dike, mining efforts have been sporadic and rarely profitable.

He built a modern 3,000-foot (910m) tunnel at the site of the old American Mine, named the "Kunisaki Tunnel". Thus exposing a practice of the time wherein 95 percent of all the worlds sapphires were heat-treated to enhance their natural color. [27] About two percent of Yogo sapphires are purple,[18] due to trace amounts of chromium. Sapphires are a 9 on the Mohs hardness scale, so theyre a gem that can withstand daily wear and be handed down for generations. The so-called Cte de Bretagne spinel, which once belonged to Anne de Bretagne, is the oldest of the gems to have survived a tumultuous history involving theft, dispersal and sale.

This gemstone rich area was inhabited by the Blackfeet Indians long before anyone thought about mining Montana sapphires. [81][82] In 1985 there was a movement in Pennsylvania to require disclosure that a gem had been treated.

Hoover was part of a partnership that had been placer mining for gold and is credited as the discoverer of Yogo Sapphires. Mining Yogo sapphires has been much more troublesome than other deposits because of the fact that Yogo sapphires occur within a vertical Dike.

[94] The majority are from the Rock Creek deposit. Two of the sapphires used are cabochon cut and the rest are brilliant cut. WebThe French Crown Jewels.

Today, several sapphires are part of the Smithsonian Institutions gemstone collection including a Yogo over 10cts in size.

"[26] The roughs tend to be small and flat, so cut Yogo gems heavier than 2 carats (0.40g) are rare.

14k Yogo Sapphire and Pearl . [18] Other than Yogo, Montana sapphire mines have been less successful because they have few blue sapphires and non-blue sapphires have low profit margins.

[44] For several years, he also owned a ranch in nearby Pig-Eye Basin. [81] Intergem's marketing of guaranteed untreated Yogo sapphires set them against many in the gem industry.

This minor change in county lines appears to have had no effect on yogo sapphire mining in the Lewistown area.

Corundum is one of the hardest minerals, rating9 on the Mohs scale. [68] The Yogo Sapphire Mining Corporation of Billings, Montana, was the next company to try to run the English Mine. Gold was discovered at Yogo Creek in 1866, and though blue pebbles were noticed alongside gold in the stream gravel by 1878.

[80], Intergem began planning to dig even deeper into the Yogo dike, which held more known reserves than all the world's other known sapphire deposits combined, albeit deep underground rather than near the surface in the manner of the other known deposits.

[26] The largest cut Yogo is 10.2-carat (2.04g). The Yogo Sapphire Mining Corporation then changed its name to be the same as the former English firm's name: New Mine Sapphire Syndicate. [31], There has been considerable debate over the years as to the depth of the Yogo dike and how many ounces of rough sapphires per ton it contains. [2] Hoover then purchased the original mother lode from a sheepherder, later selling it to other investors. He determined that the erosion of the dike in the current erosion cycle was minimal. The stones total approximately .85 carats. Perhaps the most recent addition to the Queens collection was received as a gift in Canada marking the 150th anniversary of Canadas confederation as well as the Queens Sapphire Jubilee in 2017. Although all Montana sapphires are rare and are no longer commercially mined, Yogos are the rarest and are famous for their cornflower blue color and their place among the Crown Jewels of England.

See SIZE GUIDE to see the actual size of the stones in this necklace See DETAILS to learn more about Montana and Yogo Sapphires The Stuart Sapphire as it has been set in Queen Victorias State Crown. Yogo sapphires are unique in that they are free of cavities mostly ,and have high uniform clarity, and do not need heat treating because their cornflower blue coloring is uniform and deep. The centerpiece of this brooch is a large luminous blue sapphire estimated to be around 20-30 carats, which is surrounded by twelve diamonds. The American Sapphire Company, which used local gemcutters from Great Falls, went bankrupt in 1909; a new firm, the Yogo American Sapphire Company, bought the American Mine, but was bankrupt by 1913. [38], "Yogo sapphire" is the preferred term for gems found in the Yogo Gulch, whereas "Montana sapphire" generally refers to gems found in other Montana locations. [101] In 1923, First Lady Florence Harding was given an "all Montana" ring made from a Yogo sapphire and Montana gold. 10:30am - 6:00pm ET WebMontana Yogo Gulch Sapphires in 14k Yellow Gold Earrings-Ready to Ship.

The Aurum Collection . Figure 3. Many of the gems on the market today are actually grayish. [88], A new owner, Michael Duane Roberts, bought the Vortex Mine in 2008. $10,728.

However, the last large-scale valuation of the royal familys collection was conducted in 1989 by Mr. Laurence Krashes, senior appraiser for Harry Winston.

In 1952, Elizabeth had the largest sapphire of the necklace removed in order to shorten the necklace.

Intergem had mined only around 700,000 carats in the first 5 years.

Citibank also had obtained a large stock of Yogo sapphires, reputedly worth $3.5million (approximately $8,818,200 as of 2023), as a result of Intergem's collapse: 200,000 carats (40,000g) of rough, 22,000 carats (4,400g) of cut gems, and 2,000 pieces of jewelry, all of which sat in the bank's vaults until 1991 when Sofus Michelsen, director of the Center for Gemstone Evaluation and creator of the Michelsen Gemstone Index, became interested.

Finds in other locations in the western half of the state occurred in 1889, 1892, and 1894. Hours Available [38] Brown also showed that distribution of gem rough through the dike was not consistent, so using an average "ounces per ton" was misleading. When the honeymoon portrait was recreated for the 60th wedding anniversary of the Queen and the Duke of Edinburgh, the brooch made a special appearance once again.

In 1963, the suite was enhanced by the addition of a new sapphire tiara and bracelet, which were made to match the original pieces. Alluvial sapphires are found in the Far East, Australia, and in three other Montana locationsthe upper Missouri River, Rock Creek, and Dry Cottonwood Creek. Sat & Sun: Variable - Try Us! Yogo sapphires are mined in Montana at Yogo Gulch, 12 miles southwest of Utica, 45 miles west-southwest of Lewistown and east of Great Falls. [31] One gneiss fragment found as a xenolith contains corundum. [35], The Yogo dike is a narrow subvertical sheet-like igneous body. The yogo dike was a unique mining area compared to other sapphire sources in the world. At the top, stationed within a cross pattee, is the octagonal-shaped rose-cut St. Edwards Sapphire. Citibank had obtained a large stock of Yogo sapphire as a result of Intergems collapse. The rock has a porphyritic texture with large crystals of orthopyroxene and phlogopite set in a fine grained matrix.

Other sapphires used included yellow, purple, pink, and orange gems. From there the creek flows southeast into the Middle Fork of the Judith River. Yogo sapphires are typically cornflower blue, a result of trace amounts of iron and titanium. [19] Yogo sapphires present an advantage to gemcutters:[20] since they are found as primary constituent minerals within an igneous bedrock rather than in sedimentary alluvial deposits where most other sapphires are located,[5][18] they retain a perfect or near perfect crystalline shape, making cutting much easier, as does their lack of inclusions, color zoning, or cloudiness. 346, 400 P. 2d 867 (1965), "Article 44: On the Sapphires From Montana, with special reference to those from Yogo Gulch in Fergus County", "Article 46: On the crystallography of the Montana Sapphires", "Article 45: On the Corundum-bearing Rock From Yogo Gulch, Montana", "Sapphire-Bearing Ultramafic Lamprophyre from Yogo, Montana: A Ouachitite", "Mont Code Ann 1-1-505: Montana Code - Section 1-1-505: State Gem Stones", "Facts and Reflections About Charles M. Russell", "Great Falls Yogo mine owner killed in mining accident", "How Montana Gold Rushers Literally Threw Away a Fortune in Sapphires", "Crevoshay, Kane Present Sapphire Treasure to Smithsonian", "The Untold Story Behind Kate Middleton's Engagement Ring", Birth of a Yogo sapphire (photo sequence showing cutting of 7.73 rough to a 2.62 carat finished gem), New Mine Sapphire Syndicate Records, 1889-1967, https://en.wikipedia.org/w/index.php?title=Yogo_sapphire&oldid=1138074383, Pages containing links to subscription-only content, Short description is different from Wikidata, Articles containing potentially dated statements from 2011, All articles containing potentially dated statements, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 7 February 2023, at 22:20. These xenoliths include pieces of limestone, clastic sedimentary rocks, and gneiss. Yogo sapphire mine Lewistown Montana was on a few miners bucket lists. Choose stone size. [37], The sapphire bearing Yogo dike is a dark gray to green intrusive rock known as a lamprophyre. [65] The English Mine flourished until the 1920s,[61][63] but floods on July26, 1923, so severely damaged the mines that they never fully recovered.

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