xUPDATED 7/21/2017 

Completed!  September 10-18, 2016 Denver Coliseum Gem and Mineral Show

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Completed!  September 11, 2016 "UNDER YOUR SCOPE" Minerals of Namibia.

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Completed!  September 16-18, 2016 Denver Gem and Mineral Show.  African Minerals

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Completed! October 9, 2016 "UNDER YOUR SCOPE" Minerals of Socorro Co., New Mexico.

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Completed! November 12-13, 2016 New Mexico Mineral Symposium

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Completed! November 20, 2016 "UNDER YOUR SCOPE" Minerals of the Collegiate Range, Colorado (Mt Antero etc.)

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Completed! December 11, 2016 Michael Gobla - Minerals From Selected Montana Localities

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Completed! January 08, 2017 "Under Your Scope" Minerals of Bisbee, Arizona  Second Photography Contest - Submission of Photos.

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Completed! Feb 9, 2017 to  Feb 12, 2017  Tucson Gem and Mineral Show

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Completed! February 12, 2017 Ed Pedersen- Minerals of the Gold Hill Mine, Utah. "UNDER YOUR SCOPE" Minerals of the Gold Hill Mine, Utah. Scott Braley won the Photo competition!

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Completed! March 12, 2017 Bob Hesse - Historical Micromounters and their mounts. "Under Your Scope" Colorful minerals in modern mountings and Lazard Cahn's antique mounts.

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Completed! April 09, 2017  Ron Knoshaug -- The Woftone Mine, Leadvilled District.  "Under Your Scope" Minerals of the Wolftone Mine

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Completed! May 21, 2017 Moved to avoid Mother's Day "Under your Scope" Minerals of the British Isles.  Micromount Competition.

Marcus Lieberman  won the micromount competition!

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Completed! June 11, 2017 Ed Pedersen -- Minerals of the Gold Hill Mine, Utah - Part II "Under Your Scope"  Micromounts from last month's micromount competition, and eye candy mounts from the museum's collections.

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Completed! July 9, 2017 "Swap meeting" bring specimens or equipment that you want to trade.  Do a good job triming samples to a convenient size and labeling them.  This swap will only be for excanges, no sales. Everything must be removed from the room when the swap is over.

Annual meeting:  Dues to be paid, and election of officers to serve for the coming year.

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Completed! August 13, 2017 Copperopolis, Copper City, and Copper Cliff – Microminerals from three of Montana’s obscure copper deposits.  By Michael J. Gobla, P.E.

Go to the bottom of this column for an abstract of Michael's talk.The presentation will include photographs of the sites and minerals collected at all three locations.

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August 26-27, 2017 Field Trip to Leadville (Sherman Tunnel, Wolftone Ore Pile) 

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September 10, 2017 "Under your Scope" Gold, Silver and related minerals. 

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September 13, 2017 Colorado School of Mines  Mineral Museum's Open House 6PM

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September 15-17, 2017 Denver Show -- Gold and Silver.

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October 8, 2017 Identification of Unknown Minerals -- Mike Gobla  " Under your Scope" Group examination of member's specimens (Limit 8 per member)

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November 11-12, 2017 New Mexico Mineral Symposium

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November 19, 2017  "Under your Scope" Group examination of member's bragging samples (Limit 10 per member). 

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December 10, 2017  "Under your Scope"

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January  13, 2018 Microphotography Review  -- Mike Gobla

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February 8-11 2018 Tucson Show 10, 2018 

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February 10, 2018  Open

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March 10, 2018  Open

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April 14, 2018  Open

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May 20, 2018







 The presentation will include photographs of the sites and minerals collected at all three locations. 

Copperopolis, Copper City, and Copper Cliff – Microminerals from three of Montana’s obscure copper deposits.  By Michael J. Gobla, P.E.

Abstract

Although Montana is world famous for its enormous copper deposit at Butte, copper mining in the Treasure State was first undertaken at Copperopolis in Meagher County in 1866 when 5 tons of high grade ore was shipped to the United Kingdom for processing.  This district saw a number of ups and downs.  Although the deepest shaft reached to 625 feet in depth with more than 2,000 feet of drifts, production was small.  The district has produced exceptional microcrystals of malachite, along with chrysocolla, massive cuprite, and small flakes of native copper.

Copper City in Broadwater County is a skarn deposit that was discovered in 1874.  It produced a small amount of high-grade gold ore starting in 1879.  In 1906 a shaft was sunk eventually reaching 600 feet in depth.  There was a small amount of copper ore (massive chalcopyrite and chalcocite) produced, but the venture failed.  The waste dump contains masses of brown vesuvanite and green diopside.  The site has produced microcrystals of clintonite, diopside, grossular, magnetite, and vesuvanite. 

The Copper Cliff in Missoula County forms an impressive sight.  It is a 150 ft. tall quartz cliff with blue and yellow colored streaks from mineral coatings.  Discovered in 1891 it produced 110,898 pounds of copper along with small amounts of silver and gold.  Currently it is being explored for a deep porphyry copper deposit.  In addition to malachite, azurite, and chrysocolla, the quartz breccia mineralization includes small amounts of arsenate minerals including crusts of the rare mineral chenevixite, microcrystals of olivenite, and previously Bart Cannon made a single find of some of the world’s best euchroite crystals. 

The presentation will include photographs of the sites and minerals collected at all three locations.

quartz breccia mineralization includes small amounts of arsenate minerals including crusts of the rare mineral chenevixite, microcrystals of olivenite, and previously Bart Cannon made a single find of some of the world’s best euchroite crystals.   The following image of euchroite is by Michael Cline on Mindat