1it is on the sides they break it with hammers.
Thus broken off, the rock
tumbles down; or if it still remains, they break it off with picks. Rock
and earth on the one hand, and metal and ore on the other, are filled into
buckets separately and drawn up to the open air or to the nearest tunnel.
If the shaft is not deep, the buckets are drawn up by a machine turned by
men; if it is deep, they are drawn by machines turned by horses.
tumbles down; or if it still remains, they break it off with picks. Rock
and earth on the one hand, and metal and ore on the other, are filled into
buckets separately and drawn up to the open air or to the nearest tunnel.
If the shaft is not deep, the buckets are drawn up by a machine turned by
men; if it is deep, they are drawn by machines turned by horses.
It often happens that a rush of water or sometimes stagnant air hinders
the mining; for this reason miners pay the greatest attention to these
matters, just as much as to digging, or they should do so. The water of the
veins and stringers and especially of vacant workings, must be drained out
through the shafts and tunnels. Air, indeed, becomes stagnant both in
tunnels and in shafts; in a deep shaft, if it be by itself, this occurs if it is
neither reached by a tunnel nor connected by a drift with another shaft;
this occurs in a tunnel if it has been driven too far into a mountain and no
shaft has yet been sunk deep enough to meet it; in neither case can the
air move or circulate. For this reason the vapours become heavy and
resemble mist, and they smell of mouldiness, like a vault or some under
ground chamber which has been completely closed for many years. This
suffices to prevent miners from continuing their work for long in these places,
even if the mine is full of silver or gold, or if they do continue, they cannot
breathe freely and they have headaches; this more often happens if they
work in these places in great numbers, and bring many lamps, which then
supply them with a feeble light, because the foul air from both lamps and
men make the vapours still more heavy.
the mining; for this reason miners pay the greatest attention to these
matters, just as much as to digging, or they should do so. The water of the
veins and stringers and especially of vacant workings, must be drained out
through the shafts and tunnels. Air, indeed, becomes stagnant both in
tunnels and in shafts; in a deep shaft, if it be by itself, this occurs if it is
neither reached by a tunnel nor connected by a drift with another shaft;
this occurs in a tunnel if it has been driven too far into a mountain and no
shaft has yet been sunk deep enough to meet it; in neither case can the
air move or circulate. For this reason the vapours become heavy and
resemble mist, and they smell of mouldiness, like a vault or some under
ground chamber which has been completely closed for many years. This
suffices to prevent miners from continuing their work for long in these places,
even if the mine is full of silver or gold, or if they do continue, they cannot
breathe freely and they have headaches; this more often happens if they
work in these places in great numbers, and bring many lamps, which then
supply them with a feeble light, because the foul air from both lamps and
men make the vapours still more heavy.
A small quantity of water is drawn from the shafts by machines of
different kinds which men turn or work. If so great a quantity has flowed
into one shaft as greatly to impede mining, another shaft is sunk some
fathoms distant from the first, and thus in one of them work and labour are
carried on without hindrance, and the water is drained into the other, which
is sunk lower than the level of the water in the first one; then by these
machines or by those worked by horses, the water is drawn up into the drain
and flows out of the shaft-house or the mouth of the nearest tunnel. But
when into the shaft of one mine, which is sunk more deeply, there flows all
the water of all the neighbouring mines, not only from that vein in which
the shaft is sunk, but also from other veins, then it becomes necessary for a
large sump to be made to collect the water; from this sump the water is
drained by machines which draw it through pipes, or by ox-hides, about
which I will say more in the next book. The water which pours into the
tunnels from the veins and stringers and seams in the rocks is carried
away in the drains.
different kinds which men turn or work. If so great a quantity has flowed
into one shaft as greatly to impede mining, another shaft is sunk some
fathoms distant from the first, and thus in one of them work and labour are
carried on without hindrance, and the water is drained into the other, which
is sunk lower than the level of the water in the first one; then by these
machines or by those worked by horses, the water is drawn up into the drain
and flows out of the shaft-house or the mouth of the nearest tunnel. But
when into the shaft of one mine, which is sunk more deeply, there flows all
the water of all the neighbouring mines, not only from that vein in which
the shaft is sunk, but also from other veins, then it becomes necessary for a
large sump to be made to collect the water; from this sump the water is
drained by machines which draw it through pipes, or by ox-hides, about
which I will say more in the next book. The water which pours into the
tunnels from the veins and stringers and seams in the rocks is carried
away in the drains.
Air is driven into the extremities of deep shafts and long tunnels by
powerful blowing machines, as I will explain in the following book, which
will deal with these machines also. The outer air flows spontaneously into
the caverns of the earth, and when it can pass through them comes out again.
This, however, comes about in different ways, for in spring and summer it
flows into the deeper shafts, traverses the tunnels or drifts, and finds its way
powerful blowing machines, as I will explain in the following book, which
will deal with these machines also. The outer air flows spontaneously into
the caverns of the earth, and when it can pass through them comes out again.
This, however, comes about in different ways, for in spring and summer it
flows into the deeper shafts, traverses the tunnels or drifts, and finds its way