What broken ore falls into the drifts is dumped into the chute most of the ore is handled from the level below. Shooting from above and below at the same time, the intervening slice is completely broken up. The slicing proceeds from one end of the block, and the ore is trammed to the other raise. 2.) Long holes are drilled with hammer drills from below and above on one end of the slice and shot. vertically apart, for a longitudinal distance of 300 or 400 ft., is attacked by two raises, which are connected by intermediate levels 25 ft. The method of mining locally employed is as follows: The whole ore-body between two main levels 100 ft. of fine, darker mud rock containing both native quicksilver and cinnabar then follows a gradual transition of vein matter into barren mud rock. The vein proper is a contact vein of typical “mud rock.” The first 10 or 12 ft., as a rule, is coarse, hard mud rock and contains cinnabar only then comes from 7 to 10 ft. The foot wall stands nearly vertical and is either serpentine or barren sand rock. in width, and has its own local characteristics. The mud rock being soft and slaky became easily dangerous and impossible to work. None gave satisfaction on account of the peculiar character of the ground. Square setting and filling was out of the question, so various attempts with cheap methods were made, among them a shrinkage system. ![]() The low cost of mining was the principal consideration, since, with mercury’s price per pound, the total gross value of the ore did not exceed too much per ton. ![]() Quicksilver Ore Mining & Reduction Method
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