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Preliminary Control Technology Assessment of Standard Metals Corporation, Silverton, Colorado, Report No. CT-111-15A.

Authors
Godbey-FW
Source
NIOSH 1981 Sep:4 pages
Link
NIOSHTIC No.
00182763
Abstract
A visit was made to the Standard Metals Corporation (SIC-1031), Silverton, Colorado, to evaluate control methods used to prevent worker exposures. The facility was involved in the beneficiation of lead (7439921) ore. Substances used in this process which can be dangerous to workers include lead (7439921), silica (14808607), nuisance dusts and flotation reagents. The mill processed about 1,000 tons of crude ore per day. Mine ore was hauled by truck and dumped in a coarse ore bin. Ore was reduced to less than 3 inches in a jaw crusher and further to minus 3.4 inch in two cone crushers. Ore was stored in a 1000 ton capacity fine ore bin from which it was further comminuted in a rod mill, passed through a spiral classifier into a cyclone feed pump. Underflow passes to a Denver mineral jig which separates the gold with the remainder of the material being dewatered and solids pumped to the tailings pond. Overflow goes to the lead flotation circuit where both lead and copper were floated off as a concentrate. Tailing went through the zinc flotation circuit to yield a zinc concentrate. Calcium- hypochlorate was added to the liquid to destroy the sodium-cyanide before being allowed to overflow into the river. Respirators and other personal protective equipment were used extensively. The author recommends that this company not be included in an in depth study.
Keywords
NIOSH-Author; NIOSH-Survey; Field-Study; CT-111-15A; Region-8; Control-methods; Control-technology; Refineries; Metal-refining;
CAS No.
7439-92-1; 7439-92-1; 14808-60-7;
Publication Date
19810923
Document Type
Field Studies; Control Technology
Fiscal Year
1981
NTIS Accession No.
PB89-129787
NTIS Price
A01
Identifying No.
CT-111-15A
NIOSH Division
DPSE;
Priority Area
Control Technology and Personal Protective Equipment; Research Tools and Approaches; Control-technology;
SIC Code
1031;
Source Name
Division of Physical Sciences and Engineering, NIOSH, Cincinnati, Ohio, 4 pages
State
CO; OH;
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