and hundreds of feet into the earth
--he illustrated by saying it was like a curb-stone, and maintained a
nearly uniform thickness-say twenty feet--away down into the bowels of
the earth, and was perfectly distinct from the casing rock on each side
of it; and that it kept to itself, and maintained its distinctive
character always, no matter how deep it extended into the earth or how
far it stretched itself through and across the hills and valleys. He
said it might be a mile deep and ten miles long, for all we knew; and
that wherever we bored into it above ground or below, we would find gold
and silver in it, but no gold or silver in the meaner rock it was cased
between. And he said that down in the great depths of the ledge was its
richness, and the deeper it went the richer it grew. Therefore, instead
of working here on the surface, we must either bore down into the rock
with a shaft till we came to where it was rich--say a hundred feet or so
--or else we must go down into the valley and bore a long tunnel into the
mountain side and tap the ledge far under the earth. To do either was
plainly the labor of months; for we could blast and bore only a few feet
a day--some five or six. But this was not all. He said that after we
got the ore out it must be hauled in wagons to a distant silver-mill,
ground up, and the silver extracted by a tedious and costly process. Our
fortune seemed a century away!

But we went to work. We decided to sink a shaft. So, for a week we
climbed the mountain, laden with picks, drills, gads, crowbars, shovels,
cans of blasting powder and coils of fuse and strove with might and main.
At first the rock was broken and loose and we dug it up with picks and
threw it out with shovels, and the hole progressed very well. But the
rock became more compact, presently, and gads and crowbars came into
play. But shortly nothing could make an impression but blasting powder.

That was the weariest work! One of us held the iron drill in its place
and another would strike with an eight-pound sledge--it was like driving
nails on a large scale. In the course of an hour or two the drill would
reach a depth of two or three feet, making a hole a couple of inches in
diameter. We would put in a charge of powder, insert half a yard of
fuse, pour in sand and gravel and ram it down, then light the fuse and
run. When the explosion came and the rocks and smoke shot into the air,
we would go back and find about a