Le ee 95 Considerable variation occurs along the veins, but the present develop- ment does not indicate what the factors are that, control these variations. No marked differences appear between the outcrops near the creek bottom and those on the hill, 400 feet or so above. In one case richer values were found on a flat vein crossing several vertical ones, and in further develop- ment it would be well to keep in mind that good ore is apt to be found at the intersection of fissures. / MANGANESE. ’ | In the summer of 1918 the writer visited a manganese claim situated some 10 miles northeast of Clinton. The deposit occurs on one of the . foothills of Macble mountains about 2 miles north of Clinton creek and may be reached by an old trail from Clinton. The owner is W. Murray of New Westmiaster, B.C. The ores were seen in an open-cut 38 feet long by 4 feet wide and from 5 to 7 feet deep, situated on the east slope of a hill, some 100 feet below its summit. For several hundred yards on all sides of the open-cut, the rock is drift-covered. The ore occurs in argillites and quartz- ites of the Cache Creek series. The following ascending section was seen in the open-cut: (a) thin-bedded, siliceous argillite + to #-inch beds, 12 feet; (b) bluish-grey, dense quartzite cut by quartz stringers and impreg- nated in an irregular manner with black manganese, 20 feet; (c) greenish- white beds of quartzite 1 to 2 inches thick, 4 to 5 feet. The general strike of the beds is north 55 degrees west, dip 40 degrees to 70 degrees to the southwest. The ore minerals are psilomelane, manganite, and pyrolusite. A fault occurs between zones (a) and (b) accompanied by much alteration of the rock to clay, in which the best ore seems to lie. Stringers of quartz cut across the bluish-grey quartzite of zone (b) and they are accompanied by nodules and irregular masses of the black ore. ‘The ore is also concen- trated near fracture planes where the rock is in many places altered to clay. A few stringers of ore occur in zone (c), but most of the ore is in the lower 15 feet of zone (b). The ore seems to have been introduced into the quartzite with the quartz veins and to have impregnated the country rock in an irregular manner. It has been enriched in places by leaching away of the country rock by surface waters. The writer took a sample representing the first 4 feet of the wall from the floor of the open-cut upwards, and across the lower 15 feet of zone (b). The result of an assay of this sample by F. W. Baridon is as follows: Wraneantse sci) Gates ti. Jere. cee i. ti eee .... 7:57 per cent. Deda et i Tecate. ss alge eel es Laue SE eee. eee 82-57 a PERVAVHIGEUR. hoe 6 8s aa fie he ao ig ss EP Bee Geese 0-018 6 The high percentage of silica is due as much to the country rock included in the sample as to quartz gangue. The ore is too low in manganese and much too high in silica to be of commercial valuet. 1Allen, M. A., and Butler, G. M., ‘‘Manganese,”’ Univ. of Arizona, Bull. No. 91, pp. 20-23. 5172—73 corners ee HAT NTE at ETE DO ivonesss ra SE MSO IL EN