Unlike many of the mining sites I've visited, the machinery in place at the Mammoth Consolidated Mine was remarkably intact. When sitting, machinery has two main enemies: nature and humans. Captain Obvious strikes again! Let me explain a bit.
Snow gets deep in Mammoth Lakes. In fact, there were still a few snow patches on the ground during our early August visit. Snow in August? Yes, and this was at 7,000 feet not on the summit of an 11,000-foot Sierra peak. While a single snowflake glides gently to earth, multiply that by several gazillion and you've got a heavy snowpack that crushes things.
As for humans, we're just as good at wrecking as we are at building. Once a mine is abandoned, stuff starts disappearing.
Several big machines are still there for the viewing at the Mammoth Consolidated Mine, this mobile air compressor among them. Check out the huge radiator on the far end of the cart, and the aluminum engine block.
Finally, BFGoodrich tires have been around for a long time. Yes, those are Goodrich tires as the label molding on the sidewall clearly shows.