Faulted sulfide vein, Golden Sunlight Mine, Montana

Here’s a really cool hand sample my student Xiuming found when were were exploring the waste rock piles at the Golden Sunlight Mine near Whitehall, Montana, the week before last:

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That’s a vein of pyrite and chalcopyrite, offset along a series of three small fault zones:

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Pocket faults! Three for the price of one.

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