. The Canadian naturalist and geologist. Natural history -- Periodicals. 358 The Acton Copper Mines, copper ore of the conglomerate is related to the fragments, were ascertained by slitting a slab of the rock by means of a lapidary's wheel and polishing the surface. The same test has been applied to a block of the Upton conglomerate, and it is found there is some analogy in the two cases, except that the Upton ore is alto- gether pyritous sulphuret and much more thinly distributed among the fragments. While large blocks of the Acton conglomerate give thirty per cent, and upwards, of pure metal
. The Canadian naturalist and geologist. Natural history -- Periodicals. 358 The Acton Copper Mines, copper ore of the conglomerate is related to the fragments, were ascertained by slitting a slab of the rock by means of a lapidary's wheel and polishing the surface. The same test has been applied to a block of the Upton conglomerate, and it is found there is some analogy in the two cases, except that the Upton ore is alto- gether pyritous sulphuret and much more thinly distributed among the fragments. While large blocks of the Acton conglomerate give thirty per cent, and upwards, of pure metal, the best blocks obtain- ed by me from the conglomerate of Upton do not yield more than five per cent. But this if the quantity of rock with such a per centage were larger and the masses not too widely scattered, would constitute a valuable mine. It would, however, require a careful crop trial to determine whether the quantity is ; Since these observations have been made by Sir William Logan, the cupriferous deposits have been much more exposed, and their character more distinctly marked. In order to bring the matter fully befo)"e our readers we would further avail ourselves of certain geological notes which we found in the hands of the proprietors of the mines, and which we are kindly permitted to use, the descriptions and conclusions of which, after careful inspection of the ground, we are disposed to accept. 1. A2o;pearances of Mr. Sleeper^s Openings. Eastern Opening.—Beds dip N. 40"" W. about 50°, and consist of nodular limestone alternatino- with shale and over- laid by it. Copper Pyrites in small, apparently not workable, quantity, occur in both rocks, especially at their junction. The shale is much tinged with carbonate of copper. Underlying the limestone is a hard gray, irregularly bedded, earthy rock (? a volcanic ash or tufa). This rock I regard as allied to Palagonite tuff, and for convenience shall call it simply tufa or tufaceous r
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