The Alaska prospector., 1903-08-13
The LatOuche Properties
Description of Copper Properties on Latouche, By An
 Expert.

Latouche property will be of gen. eral interest, coming as it does from a mining engineer of established reputation:
 "The Copper deposits upon La Touche island lie in the general copper bearing zone of rocks, which form the great interior Copper riv- CT country, ie. the greenstones; but upon Latouche is nowhere found any limestone to correspond to the so-called Chittitu limestone. But in place of the latter are green and black slates and sand rock made up largely of coarse, gritty, particles, flint-like in character, to which has been given the name of arkoses. This sand rock lies em- bedded conformably with the slate cleavage and is, like the latter, a purely sedimentary deposit belong ing to the palaezoic period and laid down with the slates, which were aiterward upturned. In this sand rock, on account of its porous na- ture much of the copper ore has found q resting place, while in the true slates little or no copper sul- phide is found, there being large percentage of iron present, however, in the sulphide state.
 "The principal veins of ore on the island are two in number, strik- ing N.N.E. and S.S.W., or, in other words, nearly following the coastal line the entire length of the island. The veins parallel one another nearly, are separated by a high range of rugged hills and are about two miles apart, one lying upon the west coast and the other upon the east of the island. There are several minor veins, a few being of considerable extent, yet all con- form to the general strike and all dip away from the apex about 75 degrees west.
 "The west vein has gained some little celebrity as it embraces the famous Bonanza group of claims, which is being developed system atically by Mir. A. K. Beatson, the present owner. Here huge bluff of ore stands to height of 80 feet on its outcrop and about 125 feet above tide level. The country rock along the hanging wall having crumbled away, it has left exposed this great vein of mineral, the width of which is fully 100 feet, as already ascertained by two drifts which crosscut it at different eleva- tions.
 The character of the ore is chal. copyrites or iron-copper ore, bornite and iron pyrites, running on an average 11a per cent. copper and one-tenth of an ounce in gold per ton.
 The management of the Bonanza has just completed a tram road from the mine to the dock, and will soon begin shipping ore to the smelter at Tacoma. Many tons art now lying in the dock warehouse
 Contiguous to the Bonanza group are the claims owned by Geo Esterly, Robt. Blei and J. D. Meen. ach. Here much development, work has been done, especially up on the Black Bird mine, which shows up large body of good orc It is proposed to drive a crosscut tunnel further down the hill, tap. ping the vein at a depth of over 100 feet, and building a tram from this point to the mill situated near tide level.
 "TO the south of the Bonanza group is the Iron Mountain grouI belonging to the Gladhough estate
 "On the east coast of La Touche is situated the Carlson x Svenson group of claims, embracing B loca. tions toward the north end of the island. being on two parallel veins, and ten claims upon the southern end of the island. The ore com pares very favorably with the Bo. nanza ore, and shows vast depos. # of chn1ooon,sfao nc f,n.,, Q x<> on f<oy