Show 0 HYDRO GOLD GRAVEL DUMP this property consists of about one million tons of gold gravel tailings comprised in one dump covering about ten acres to a depth of from twenty to feet the gravel was washed by huge hydraulic giants from the rich coon hollow placer surface gold mines and deposited by torrents of water through a four foot sluice box at the head of coon hollow ravine just south of the big cut which was made by hy through the high ridge back of placerville erville 2000 feet south of the southwest corner of the city limits and 1800 feet east of the sacramento and placerville erville railroad track the hydraulic mining that formed this tailings dump was conducted on a large scale in the latter coon hollow was then a live large mining camp only the cream as it were of the gold which was plentiful in those days was saved and at that coon hollow has a record of producing over six million dollars in placer gold from surface washings the said dump where went in the rush of the hydraulic waters the balance of the gold has been untouched for over sixty years except being weather worn and slacked by the elements and is now overgrown by scrub oak and chaparral and pine trees over forty f feet beet in height and a foot or more through at the butt the dump is now being systematically surfaced sampled and will then be further tested by drilling a number of vertical holes to bedrock the values consist of free gold and platinum contained in the black sand as well also in the large quantity of quartz pebbles and particles of cemented gravel of which the dump is composed from a preliminary sampling of the dump made last spring it is estimated to contain around 5 in free gold per ton of gravel no test of the platinum values were then made the machinery that will be installed to reduce the material will consist of an electric shovel shaking grizzlies grizzlier grizz lies revolving screens a bariel barrel gravel mill and a ball grinding mill and concentrators all operated by electricity an electric power transmission line passes by the east end of the dump after all the values are recovered the ejected rocks will be crushed for road surfacing and the washed gravel and sand will be screen sized for concrete material carl tombo an engineer of philadelphia who made a preliminary examination of the dump the first part of september will arrive in placerville erville october 13 to personally oversee the progress of the work burr evans in eldorado republican placerville erville california |