Here's a photo of a typical mine near Idaho City, Idaho. It was probably taken in the mid 1890s, maybe a little earlier. There was a mix of hard rock, placer and hydraulic mining in the area. This was either a fair sized placer operation or maybe a hard rock mine. I'm pretty sure that it's not a hydraulic mine.
My folks on the McNeil side (whom you haven't met yet) were mostly miners and were involved in all three types of mining. The Coopers figured out after California that mining was a hell of a lot of work for the money.
This may be one of the McNeil boys - unfortunately, the photo is only marked "Idaho City Mine".