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promotbu tiie Dunri -iawn Minas Ua. <br />The Penrose Shaft was selected ae the main pumping shaft, 3j~'{ <br />being dawn a depth of 900 feet reaching a point ae law as any {~~ <br />Via; j <br />workings in the basin, and eleotrically driven centrifugal pumps j <br />were installed. ~ i~~€ <br />The use of centrifugal pampa in deep mine pumping is as I ,~~~~, <br />yet quite a new practice but they are doing exceptional work on Ci~~ <br />y ~ <br />~ III <br />the Penrose,and the old pump men of the district, who have always `~~~~ <br />been used to hu station y ~ iy~,ll <br />gh pampa, when the see the same water `1r <br />handled by these small centrifugal pumps, stand in open eyed ~~,~;:~ <br />~~~. <br />surprise. This shaft ie connected with the Cornado Shaft on the `~il;f;~ <br />900 foot level, the bottom of this shaft being only el ightly ~ + <br />deoper than the bottom of the Cornado Shaft. l I~' ' <br />',;~f <br />TOPOGRAPHY. ~i iNaN n <br />This group is eituatsd at an altitude of 10280 feet and r~!~. f <br />~~~, <br />covers a sloping hillside whioh is barren 3f all vegetation. ~~~,I ~l{ ~I,I p ~ <br />All parts oP the group can ba reached by good wagon <br />roads and both the D.& R.G and tho Cola. itidland Railroads have ~f!~f ~il' ~ <br />tracks to many of the mines: <br />GEOLOGY AND ORE OCCURANOE. <br />The geology here is the same as for tho entire diotriat I~~ulllf {~'1 ~~~1'~I~II-9~1 <br />around Leadville, as accurately shown by the Emmons Geollgical fI~I7~u~t~tll~1~ ~ I~~I~~IIB~~I' <br />Survey, and the Penroso Shaft passes through the entiro aeries <br />from the Weber Grits to the Cambrian Quartzite. The bottom of <br />the shaft being in the Cambrian Quartzite nt the present. <br />Tho properties of the grou p Produood a largo tannage <br />of oro from the uppor aontaot or oarbonate zone and also from <br />the lower oonteat or sulphide zone. <br />1'he oro Pram the uppor aontaat consisted of oxides and <br />carbonates of lead, zlnar iron and manganese whioh in tunny oeoes <br />carried high values in silver. Tho lower contact minerals were <br />sulphides of the same minerals. <br />1'ho fissures whioh ore to bo found in eastern part of the <br />district are leoking here, the oro deposits being, confined almost ~ ~ <br />j <br />entirely to the blanket or oontiaot ooaurenoo. I ~ i' <br />D7ETJi0DS OP' 1dINTNG AND TIIdDISRINO. <br />The ors is all mined in open over hand stopes and put <br />dawn to the levels in ohutes of common board ohuto yype. <br />'- n~~ <br />