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Geology/mineral indentification

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Question
I found a greyish/silver specimen while panning a Colorado river. Specimen is malleable, ductile, non ferrous and not affected by heat. I can provide pics after a response.

Answer
Dear Chauncy

You might have found a piece of electrum which is a natural alloy of gold and silver. Electrum can occur in epithermal gold deposits. So, upstream such a deposit might exist. Measure the density of your specimen to make sure.
This is only a guess.

Yours
Meisam

Geology

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Meisam Rasouli Beirami

Expertise

Magmatic Ore deposits; Igneous Rocks; Uranium Ore Deposits; Mississippi Valley Type (MVT) Deposits; Remote Sensing; Satellite Imagery Processing;

Experience

I have done a thesis on magmatic uranium deposits. I ma currently working on MVT ore deposits and their exploration via satellite imagery.

Organizations
Shiraz University, Shiraz, Iran Golestan University, Gorgan, Iran

Education/Credentials
Bachelor's degree of geology: Tehran university, Iran. MSc of economic geology: Gorgan university, Iran. PhD student of economic geology: Shiraz university, Iran.

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