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Minerals of the Metallic Ore Deposits of the American Southwest Symposium

Last Updated: 6th Dec 2018

By Erin Delventhal

This is a LIVE report, keep this page loaded for live updates - new images will appear as they are added.

I'm live this weekend at the Minerals of the Metallic Ore Deposits of the American Southwest Symposium, held at the Colorado School of Mines and sponsored by the Friends of Mineralogy Colorado Chapter, the Colorado School of Mines Geology Museum, and the Friends of the Colorado School of Mines Geology Museum.

I've arrived a bit early to see what's new at the Colorado School of Mines Geology Museum.

One of the things I've been looking forward to seeing is a guest display of Midwest Minerals from our very own Kevin Conroy!

Honessite after millerite, Antire Road - Interstate 44 Intersection, Missouri.

Marcasite on galena, Sweetwater Mine, Missouri.

A beautifully twinned galena from the Brushy Creek Mine, Missouri.

Cerussite and pyromorphite, Webb City, Missouri.

A magnificent siegenite specimen!

Some classic large cabinet pieces!

I think these might be my favorite though - marcasite after anhydrite from the Sweetwatwr Mine.

Really well done, Kevin!

There are some very nice specimens from a recent donation from the Hilja K. Herfurth Trust.

Including a large petalite crystal from Paprok, Afghanistan.

A pretty serious Tsumeb cerussite sixling twin.

An even larger petalite crystal.

Hibonite from Elsiva, Madagascar.

A Hiddenite, North Carolina emerald!

Several topaz doorstops.

I have included these in a previous live report, but the Wolcott Silver Pitcher and Tray (made from Creede, Colorado silver) have a new display case - they are showcased very nicely!

The museum specializes in Colorado minerals, so we'll have a look at those for a while.

Molybdenite on pyrite, Rico District, Colorado.

A carnotite concretion in sandstone, Gateway District.

For the tellurium fans: calaverite from Cripple Creke District.

A gold pseudomorph after sylvanite, Cripple Creek District.

Pikes Peak batholiths pegmatites!

A very nice zircon from Helen Hunt Falls, El Paso County.

Ktenasite on chalcopyrite with sphalerite from Creede! (I have a large soft spot for Creede.)

Cerussite plus a great old photograph of the mill.

Rhodochrosite from the Eagle Mine, Gilman District. Ed Raines will be giving a talk about Gilman on Sunday.

Pyrite after marcasite, Eagle Mine, Gilman District.

An exceptional vivianite from the Ibex Mine, Leadville District.

A large hemimorphite from the Wolftone Mine, Leadville District.

Native tellurium, Mountain Lion Mine, Boulder County.

Artifacts and scientific instruments!

Silver wires in a drill core, Aspen District.

Huebnerite with quartz, Yukon Mine, San Juan County.

Now on to things not Colorado. Richard Le Sueur has a guest display of minerals from the Nchanga Mine, Zambia.

A very cool pseudomorph of chrysocolla included quartz after azurite.

A very nice educational case about steel production.

Cuprite on copper, Rubtsovskoe Mine, Russia.

Sarabauite, Sarabau Mine, Malaysia (TL).

A number of collector favorites.

The New Mexico shelf.

The Arizona case.

I do have an opinion about the previous two images, but I will keep it to myself.

A South Dakota ferrocolumbite.

Barrierite, Rocky Pass, Alaska.

Sulfur, Alum, Nevada.

Herderite, Marilac, Brazil.

Enargite from Julcani Mine, Peru.

Anatase on quartz, Matskorhae, Norway.

Bismuth, Oberschlema, Germany.

A large aragonite from Laurium, Greece.

Quartz from Poretta, Italy.

Barite, Maine Mine, France.

Wulfenite from Slovenia.

Manganite, Ilfeld, Germany.

Strontianite, Steiermark, Austria.

We are having a small social gathering of attendees and speakers at the museum.

Mark Jacobson is making opening remarks and then we will begin the first session of talks!

Ed Raines is opening with a presentation about frontier mining methods.

Ed is discussing the development of frontier Colorado mines: here we see a boiler used for steam power.

Some discussion of the development of explosives and blasting.

Some consequences to blasting.

Transporting a mule into a mine.

Now Ed is explaining some specifics of mining methods.

Phil Simmons is now presenting about the minerals of Cooke's Peak District, New Mexico.

Some of the geology of Cooke's Peak.

Vanadinite and descloizite from the Jose sub-district.

My favorite from Cooke's Peak - the "stepped" fluorites.

The Jolly Green Giant.

Some of the color variation to the fluorites.


Brent Thorne, a serious mindat contributor, is presenting now on the secondary Minerals of Utah.

Scheelite on quartz.
(I apologize for the terrible color banding in these photos, but that's a good reason to go to symposiums in person!)

A rather large aurichalcite.



Very nice eurekadumpite.

I've just finished giving giving my first symposium presentation on the Blanchard Mine and I am feeling much more relaxed now that's it over.

Now Bob Larson is presenting on the accessory Minerals of the Silverton Caldera.

Sunnyside gold from the upper levels - right below Lake Emma.

Typical ore of the Silverton Caldera.

Twinned sphalerite from the Idarado.

Rhodochrosite with chloritic quartz from the Grizzly Bear

Bob Hembree is now talking about the Magdalena District, New Mexico.

An older map of the Kelly and Juanita Mine workings.

Some underground shots of the Kelly.

Jeff Blackmon is presenting about Carlin Type Gold Deposits.

Characteristics of Carlin type deposits.

Late stage orpiment in drill cores.

Arsenic/antimony things!


Karen Wenrich is presenting about uranium breccia pipes.

Reflected light photomicrographs.

Ed Raines is now presenting on the Gilman District, Colorado.

Underground collecting at the Gilman Mine - an odd choice of seating...

A very interesting pyrite from Gilman.

A really neat quartz specimen.

Michael Michayluk is now presenting on the Torpedo-Bennett fault zone.

Copper and cuprite from the Torpedo Mine.

Cerussite from the Memphis Mine.

Stephenson-Bennett cerussite.

Mimetite-vanadinite series, Stephenson-Bennett Mine

Pete Modreski is now presenting on outstanding minerals of the metallic ore deposits of New Mexico.

San Pedro Mine gold

Poison Canyon uranophane specimens

Denver shaft wulfenite

Molybdenite from the Questa Mine. This locality closed fairly recently.

Mark Jacobson is now presenting about pinoneer mineralogists J. Alden Smith, Frederic Miller Endlich, and Jesse Summers Randall.

These stories are filled with quite a bit of drama.

The symposium talks are over and many people are off on tours of nearby gold mines, but Michael Michayluk, Phil Simmons, and I have made a hike up to North Table Mountain to beat on some basalt in search of zeolites. Here you can see Golden in the background.

The mineralization is pretty rich.

My phone is now at 1% battery so I'm signing off!

Article has been viewed at least 2749 times.


Thank you Erin for this report.

Good to see the specimens "labelled" but did they have to be so large, and could they have been a bit more detailed, especially with all the free space on them?

And not shying away from Aquas?

The Silver wires in the drill core specimen was interesting.

Cheers for now

Keith Compton
3rd Aug 2018 11:58pm
And our very own Erin is again producing an exquisite live report, while the syposium hadn’t even started yet.

You go Erin; I’m looking forward to see the rest.


Tom Costes
3rd Aug 2018 11:59pm
I do not have any answers regarding labels as that is not a thing I am responsible for, and any aquas seen have merely occurred in the background. ;)

Thanks! It's going to be a good symposium!

Erin Delventhal
4th Aug 2018 12:45am
I saw this symposium and was interested in going, but had already made plans to be on the Keweenaw Peninsula of Upper Michigan during this time. Nathalie is keynote speaker at two upcoming events so that took precedence... ;-)

Excellent report, as always, Erin! I look forward to seeing the rest of the symposium.

Paul Brandes
4th Aug 2018 1:44am
Good to see steel displayed. Things would be tough without it .
Thank you.

Frank Karasti
4th Aug 2018 2:40am
Thank you Erin for this fine report.

But there is a " thorn in the eye " in the " A number of collector favorites" case.
The torbernite from Likasi. That mine never produced torbernite.
The specimen is from Shinkolobwe, not even Musonoi.

hope this helps.



Paul De Bondt
4th Aug 2018 7:43pm
Hiddenite is located in Alexander County, NC, not Spruce Pine, Mitchell County, NC.

Fred E. Davis
5th Aug 2018 12:28am
Same as Fred said above! Definitely not a Emerald from Spruce Pine District. That Emerald is from Hiddenite for sure! FYI one of specialties is NC! I wonder who made that blunder lol

Michael Lambert II
5th Aug 2018 5:50pm
Same as Fred said above! Definitely not a Emerald from Spruce Pine District. That Emerald is from Hiddenite for sure! FYI one of specialties is NC! I wonder who made that blunder lol

Michael Lambert II
5th Aug 2018 5:51pm
It was mentioned to me by someone else that that mistake has been pointed out nearly a year ago and still remains.

Erin Delventhal
6th Aug 2018 1:01am
Great report Erin, and also awesome to see you there with an excellent presentation!

Aaron Cross
7th Aug 2018 2:51am
Excellent and very enjoyable report, Erin. Wish I had been there! Thank you for photographing and posting it.

Donald B Peck
14th Aug 2018 4:42pm

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