Here is something my wife found today during our adventures between CA and Goodsprings. Kind of hard to see, but try to focus on the brightest spots in the rock. It's really bright in the sunlight. We took it to a coin shop near our house to have it acid tested. It's silver. Not a lot.
Unless we busted it out of the matrix rock surrounding it, we'll never know how much silver. I wouldn't estimate the total weight to be more than a few grams. Since silver is still only around $50 an ounce, I don't see it as worth breaking up so it'll sit with the rest of our growing rock collection.
My wife sure has a nose for silver. I wish she'd tune it for gold.
The most complete guide to Southern Nevada historic mining.