In-depth survey report: control technology for mine assay laboratories at Skyline Laboratories, Inc., Wheat Ridge, Colorado, report no. CT-198-14b.
NIOSH 1994 May; :1-34
A survey was conducted to document and evaluate effective technologies for controlling exposures to arsenic (7440382), cobalt (7440484), lead (7439921), and respirable crystalline silica (14808607) to below the required limits at Skyline Laboratories (SIC- 8734), Wheat Ridge, Colorado. This commercial mine assay laboratory analyzed samples from various mines throughout the world. There was one shift per day, consisting of about 15 employees. Approximately 130 assay samples were processed during the 3 days of the survey. The local ventilation systems in the sample preparation area appeared to control exposures. A conscientious effort to minimize the use of compressed air helped lower exposures in this area of the laboratory. The face velocities of all hoods ranged from 20 to 54 feet per minute (fpm), significantly below the recommended 200 to 500fpm levels. Decreasing the hood areas would economically increase the face velocities. Dust collection systems in the crusher room and north side of the pulverizer room recirculated filtered air back into the sample preparation room. The authors recommend that increasing the velocity of the exhaust hoods be increased, the structure of the hoods be modified, a respiratory protection program be established, and the pouring table be repositioned closer to the ventilation hoods.
NIOSH-Author; NIOSH-Survey; Field-Study; CT-198-14b; Region-8; Control-technology; Mineral-dusts; Airborne-dusts; Dust-control; Dust-exposure; Laboratory-workers; Fire-assays; Heavy-metals
7440-38-2; 7440-48-4; 7439-92-1; 14808-60-7
Control Technology; Field Studies
NTIS Accession No.
National Institute for Occupational Safety and Health