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Les diagrammes suivants illuatrant la mAthode. 1 2 3 1 2 3 4 5 6 MICROCOPY RESOl'JTION TEST CHART (ANSI and ISO TEST CHART No 2) U£ IS 1^ I 40 2.5 m 2.0 1.8 J ./IPPLIED INA^GE Inc .^ 165 J tost MoJn Street S^S Rochester, New fork 14609 USA '-aa (716) 482 - 0300 - Phone ^S (716} 2J8 - 5989 - Tax / ,"< ,' I ' Notes to Accompany One Plan and Three Verti- cal Sections of the Athabasca nine, on Toad Mountain, near Nelson, British Columbia. By U. Nklson- Fi',r.i„ A.R.S..M., Nelson, 1!.C. Tlie vein cuts across a wfll defined conta n hetweet) a schistose eruptive rock and a more recent granite. This rrea of schistose ro( ks ard its no them contact with tiie granitoid area is shown in the recon- naissance map, published in Part li, Annual Report, \"ol. I\' , of the Geological Survey of Canada (Dr. I)av\-son"s Rejiort, iSSq). It is a narrow vein about one foot in width ; the gangue is (|uarl/, heavily charged with sul()hides of iron, zinc and lead, containing high values m gold and about the same number of ounces of silver as ounces of gold. 'The chief characteristics of :he vein arc : that it is remarkably well defined; that it is very continuous ; tliat it is broken by inn-jmerable faults, some of which have occasioned considerable dis[)lacement of the vein ; that it passes from the schist in»o the granite without any inter- ruption or disturhance : that the values encotuitetcd in the granite are good, but not so good as those in tiie schist, with a tendency, perhaps, to be a little pockety. In the maps herewith, the granite is indicated by crosses, the schist is in blank. The discovery of the vein was made and work was commenced on a prominent ex[)osure in the granite. A tunnel was run in at the point marked on the plan " Main tunnel entrance," and a shaft was sunk on the vein near the i)ortal and the vein stoped out down to ? fault; to recover the vein on the other side of this fault, crosscuts were put in, both on the hanging and the foot-wall side, but without result The " Main tunnel " was then carried on into the schist, and, shortly afterwards, encountered what was then supposed to be a second vein. This vein was very flat, and disturbed by a most remarkable series of faults, running in every possible direction. The faults were, i I ■ ■ ■ . . . 7hf Ciinadiaii Mining Institute. prartiVally always, normal: atul. iti foliowitiR the vein ii|) |„ tlie surface, there was a general ten as to vvhat the results might iiave l)een, had the work originally hcen done at this outcrop, in ,te;>d of at the holder and richer ouk rop l.clow. It is n • impossible that the history ol the mine would ha\e heen materially changed. A few f,eneral points may I'C sunuiied up as noteworthy. Firstly : tiiat the vein occurs cutting hotii granite and S( hi.st. Secondly: that there is a remarkable concentration of values along the contact, pspeciaily on the s. hist side. Thirdly: that the values in the granite do not avera-e as well as in the schi.t ; the vein being inclined to be m..,e iiiumh, both in si/e and coniepts. Foiitthly: that the vein in the granite is louiid in a more normal condition and is better adapted for miring. Tijtlily: that in the schist the vein is fat and ver> much disturbed by faults and fc'ds, and finally enters upon an area ui grcund win. h is so shattered that all traces of the vein are lost. It ., i)robable that it will be recovered here at so'iie deejier point, approach being made from the granite 5/.v////r.- that extrenie caution must be exercised in undertaking the opening up ul a vein in shattered ground of this kin Thtories of p.ir.illel ore bodies and numerous veins may be rudely dispelled by events, and the plan of work must be held continually subject to mod- ification. Only the most shadowy estimates can at any time be i.iade of ore in sight, and the plan of operation, can only be outlined in a vague way. To open up a mine of this description i. ai entirely differ- ent proposition to that of opening up a regular ore Lody. It would appear, however, that the vein, where it i.s now being worked in th>! grnnite, has at last repched a condition of permanency, and it is likely that it will retain this character, as further depth is attained. I have attempted to outline the doubts and difficulties connected with opening up an ore body of this charai ter, This is a class of min- \ f I I TABLE or ALTITUDES e M D Q Q B 6Z .'•^t:^^ u The Canadian Mining Institute. ing, however, which opens up attractive possibilities and cannot be neglected. This vein yielded in thirty months $350,000 from 11,500 tons of ore. It is an open question whether the system of limited liability company organization is adapted to a mining proposition of this kind. For conducting large operations on lines which can be definitely and permanently foreseen and laid out, the present system is no doubt to be preferred. l!ut I believe that a system of assessable stock would be found to be more economical and, speaking generally, more suitable for working a property of the kind under discussion. The maps above referred to were prepared by Mr. H. W. Mussen, superintendent of the mine. I 1 i i i i