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Collection: Directories and Documents > Pamphlets

Mining Methods in Grass Valley District California From Transactions of the American Institute of Mining and Metallurgical Engineers by J A Fulton and A B Foote (PH 2-6) (1927) (14 pages)

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x » . (OL SEAR epiebaaebioe GRAB IVALmy Disrnicr, 1A: ' 2: CALIFORNIA ¢ The compressed-air : requirements are, H 4: follows: eee ees ' Hoisting. . Hr Peis P 4, Daille.ssi8 0005) chee Ventilation.i.... betes bud Pe ianncawin ny 111000, mae pels “The supplies used in mining, exclusive of Beas sit Ash form 16 percent, of the total cost; exclusive Pe ep timbeé: and power, also 16 pet's of the total cost of’ production was for all’ ‘supplies, ea vale dn + per, and power. For the first 6 months of 1922, supplies formed 2 cent, of the total cost and ls supplies font rf 25) fe rea 4.4 Ber total mining cost. rf ? ‘ sith Ai tines 3h aa ee coiling Ore recovery is probably, over. £90; ‘per. ‘cent ‘the only, from cars, etc. The foot wall of eens is pute With -bro stope is abandoned. . 2) , Every reasonable precaution is: itekant in “the. inten ist,_of safety: “Though men are trained in first. aid to have at Teast One-man go. trained ‘in es stope on each shift.) °° lnk But little welfare work is ‘done. AM en companies, by advancing purchase’ prices and allowing Hien to. éxte about 10 years, are encouraging 801 6e8: ito, own their own homes. ehh pea “W. Fr, fe pomiokay Now van: N = inthe methods of mining during tio have been found the mbst applicable ae _-change i is the use of scrapers and. iWis ‘more ont of scrapers had been givenirs. é vy thi “North Stai segoagi not, use. a hye, atten swendeti a the jue the ‘imine! itiever’ had ‘the alienate ae haulage on ‘their “forig ‘levels; 8; UN Ventilation troublel. ‘In another, geld, ‘gubstiviiting, gasoline locomotives = 4 {e! ‘ sf lor mule haulage on Jong : hauls: where. hers Ward, NO, heavy, etnies rey ( 1p considerable ‘saving. t ORM, Raynonp,: New York}: Ney, : G. A. PackAnp, Boston, Mass aol Tilted ve )O th Void onost they Were using a very light scraper of the ioe type Ess ‘hae stes side And teh on 1 the other. My i golléttion nda that’ it -W tf ip Ay 4) the miie'4 years ago,