From Roughing It, Chapter 60

In Tuolumne lived two miners who used to go to the neighboring village in the afternoon and return every night with household supplies. Part of the distance they traversed a trail, and nearly always sat down to rest on a great boulder that lay beside the path. In the course of thirteen years they had worn that boulder tolerably smooth, sitting on it. By and by two vagrant Mexicans came along and occupied the seat. They began to amuse themselves by chipping off flakes from the boulder with a sledge-hammer. They examined one of these flakes and found it rich with gold. That boulder paid them $800 afterward. But the aggravating circumstance was that these "Greasers" knew that there must be more gold where that boulder came from, and so they went panning up the hill and found what was probably the richest pocket that region has yet produced. It took three months to exhaust it, and it yielded $120,000. The two American miners who used to sit on the boulder are poor yet, and they take turn about in getting up early in the morning to curse those Mexicans--and when it comes down to pure ornamental cursing, the native American is gifted above the sons of men.

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