Preliminary Control Technology Assessment of Day Mines, Inc., Leadville, Colorado, Report No. CT-111-16A.
NIOSH 1981 Sep:5 pages
An on site visit was made to Day Mines, Inc., (SIC-1031), Leadville, Colorado to evaluate control methods used in the beneficiation of lead ore. The facility processed about 400 tons of crude ore averaging about one half percent lead each day. The concentrator process was above ground and consisted of a grizzley, primary jaw crusher, and secondary gyro crusher which reduces the ore to less than 5/16 inch. A continuous belt conveyor carried the ore to the storage bin. Ore was mixed with water and fed to the grinding circuit, where it was ground in closed circuit with hydroclone classifiers. The flotation feed pulp was conditioned by automatically controlled reagent additions and processed through the lead recovery flotation circuit. Tailings were fed through a Reichert spiral wet gravity separator. The concentrate from each circuit flowed out where the pulp was thickened and pumped to a filter and dryer. The filtered dewatered concentrate was stored for further loading. A good housekeeping program existed at this facility and a formal health and safety training program was conducted. No specific engineering controls were used. The author recommends that this site not be used for an in depth study.
NIOSH-Author; NIOSH-Survey; Field-Study; CT-111-16A; Region-8; Refineries; Dust-control; Control-methods; Control-technology;
Field Studies; Control Technology
NTIS Accession No.
Control Technology and Personal Protective Equipment; Research Tools and Approaches; Control-technology;
Division of Physical Sciences and Engineering, NIOSH, Cincinnati, Ohio, Report No. CT-111-16A, 5 pages