- ——— 204: Development The deposit is developed chiefly by two open-cuts and by one tunnel with an open-cut approach. These are respectively 20,70, and 140 feet in length, but as they all penetrate into the foot-wall and so disregard the structure of the deposit, they have not succeeded in developing any note- worthy body of ore. ‘Two shallow shafts, now full of water, were found near the entrances of two of the open-cuts, but previous reports indicate that these encountered country rock at their bottom. Several small open- cuts, pits, and shafts were observed on the summit of the hill above the 780-foot contour, but these added nothing to the development of the deposit. Analyses A few analyses are available, and are here recorded for what they may be worth. They represent samples that have been taken, without doubt, from the higher grade part of the deposit. 7 A B Cc D E F G H J Troneceetysccere en 62-65 | 58-8 48-51 54-33 50-97 40-24 52-09 56-2 50-4 Phosphorus........ 0-035 0-049 0-058 0-049 0-098 0-028 0-025) nil 0-053 Silicate cao 6-24 9-13 | 14-78 9-44 | 13-0 PULAND |p eo caer 17:0 | 18-6 Sih CRaos sopadal|anbbioncolinadaanss 1-41 1-51 2-22 0-51 0-230 1:3 0:3 Manganeses. 3050: oc }etenencel|ers loners (teed eee ees ene norm se tc| Geenance| necwoder biecobe s ADEN Sane] nonbios nal lbnours a nil nil nil DAL Ale eie tees seel| soisvemaciote trace D iat: (o) Ki}oi OM enna isa Boas memacouk eoonesncl oaonuwar|lonoddass|laonucces OEY Bacar ool lbosan sec A. d'Invilliers, E. D.: private report, 1900, general sample from ‘“‘float, boulders, and seams in the rock mass.”’ B. Ditto, from small tunnel and open-cut northwest of map-area. ‘‘General sample of this ore pile and from both sides of tunnel, cut, and outcrop above tunnel.” C. Winchell, H. V.: private report, 1902, ‘‘Analysis of average sample of ore.’”’ D. Ditto, ‘south cut east end of workings.” TE. Ditto, ‘ore pipe, mouth of tunnel.” F. Ditto, ‘‘outcrop, pinnacle of island.” G. Lindeman, E.: Bibliography, No. 16, ‘‘average sample of ore pile.” H. Brewer, W. M.: Bibliography, No. 21, ‘‘sample of solid magnetite.” J. Carmichael, H.: Bibliography, No. 6, ‘‘average sample of the ore on the dump.”’ All of these analyses confirm the statements contained in this report regarding the comparatively low grade of the Copper Island magnetite. Tonnage Estimate Since no body of ore of commercial grade is known to occur on this property, a tonnage estimate of the mixed magnetite and garnet is not considered worth while. The material of this deposit would have to be beneficiated before any of it could be shipped. There are about 100 tons of the best grade of magnetite piled on the dumps at the mouths of the three larger open-cuts. Value of the Deposit The deposit is of no value as an immediate source of iron ore, and offers very few indications of potential value. It is placed, therefore, in the group of deposits of no value.