[SunkenCiv]

Natural pyrite, also called 'fool's gold', in its typical cubic crystal shape. Credit: C. Kusebauch, GFZ

[ETL]

The Carlin-type gold deposits in Nevada, U.S., are the origin of five percent of the global production and 75 percent of the U.S. production of gold. In these deposits, gold does not occur in the form of nuggets or veins, but is hidden—together with arsenic—in pyrite, also known as "fool's gold."

From the fantastic “How The Earth Was Made” documentary series...

They begin discussing the “Carlin Trend” at the 27:16 mark of the ~45 min doc.

Season 2, episode 13: America’s Gold
https://www.youtube.com/watch?v=6baHoiV6ltg

PS-I certainly find this interesting, having majored in geology back in my mid-1980s college days. :)

Thanks for posting!

[mad_as_he$$]

We have “Borg” pyrite all over in our rock gardens. Pretty easy to find on a day field trip from the El Rancho. BTW the gold content can vary significantly within a mine. Well run mines drill core samples and map the deposit. They operators know almost to the gram what the yield will be per ton.

The Carlin deposit is a pretty unique formation. I would be surprised to find it on an asteroid or another planet.

[bert]

The gold mine in Cripple Creek Colorado. It is just awesome

All the rocks for miles around have some gold content as testified by the presence of many old mines

[fieldmarshaldj]

That’s still a beautiful mineral display, even if it ain’t “true gold.”