Transactions . p, and has been further proved to a depth of 260 feet.Below the present working-floor, thin veins of cassiterite and masses oftin- and iron-pyrites take the place of the gossan found on the surface. The Slaughter Face is of similar character, but the gossan is a littleharder and more compact; its full length is 1,000 feet, and it is opened VOL. XLLX.—1599-1900. 34 THE MIXEHAL RKSOrROES OF TASMANIA. for about half that distance and about 150 feet in depth. This depositis 230 feet wide, and the quality of ore still to be taken out representsover a million pounds. The White Face is
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Transactions . p, and has been further proved to a depth of 260 feet.Below the present working-floor, thin veins of cassiterite and masses oftin- and iron-pyrites take the place of the gossan found on the surface. The Slaughter Face is of similar character, but the gossan is a littleharder and more compact; its full length is 1, 000 feet, and it is opened VOL. XLLX.—1599-1900. 34 THE MIXEHAL RKSOrROES OF TASMANIA. for about half that distance and about 150 feet in depth. This depositis 230 feet wide, and the quality of ore still to be taken out representsover a million pounds. The White Face is an alluvial deposit, 1, 500 feet in length from eastto west, and 400 feet from north to south. It averages at present about30 feet deep, sloping upwards from a few inches to 70 feet, and carries2i per cent, of black tin—all parts of the face equalling from 2 to 3 percent. The floor consists of boulders of carbonate of iron, magneticpyrites, blende and clay ; but, however, it carries little or practically no. Fio. 4. -View of the Lower Workings of the MountBiscHuFF Tin-mine. tin, though it has been sunk to a depth of nearly 100 feet, withoutany change. The same, or very similar, materials are found at theeastern and western extremities of the other faces. A drift has been driven completely through the mountain : it passesunder the Brown Face at a depth of 260 feet, where a level has beendriven 700 feet on a lode 5 feet wide, and carrying 17 per cent, of tin. Mount Bischoff may be described roughly as a mountain of slate andsandstone intersected by a great dyke of quartz-porphyry running north- THE MINERA]. RESOURCES OF TASMANIA. 35 eastward with numerous branching dykes. In some pLaces the main dykeconsists of topaz-porphyry : it carries most of the tin, the branchingdykes being barren. Less than ^ per cent, of tin is lost in the tailings. Yet, with acomparatively small capital, Mr. H. W. F. Kayser, the able manager, has overcome enormous difficulties so as to supply the mill