Overview
Stage | Production |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Production Start | ... |
Source:
Contractors
- Subscription is required.
Summary:
The metabasalt mined at the Charmian facility is a fine grained very uniform and competent rock of high quality. Metabasalt is a volcanic (igneous) basalt that has undergone natural refinement to its mineralogy and ultimately its chemical composition through the process of metamorphism. The metamorphic process has produced a massive and homogeneous formation, which is inert, durable, and weather resistant. These unique qualities are preferred in manufacturing roofing granules.
Actinolite is a naturally-occurring mineral that is sometimes associated with mafic (dark-colored, mainly ferromagnesian minerals) and occurs in some igneous rock formations, but most commonly in metamorphic rock. Actinolite occurs in two forms – fibrous and massive. Fibrous actinolite is composed of asbestiform fibers – where “asbestiform” denotes a mineral that grows in a fibrous aggregate of high tensile strength, flexible, long, and thin crystals that readily separate forming what is known as “asbestos.” It is important to note that the vast majority of actinolite is massive, not fibrous, and thus the majority of actinolite is not asbestiform.
The occurrence of actinolite in the metabasalt formations at Charmian is rare, with actinolite typically occurring along fracture planes and joint planes. As described below, SGI has developed and implemented protocols for identifying and avoiding suspect minerals potentially containing actinolite. During the 22 years of operating the c ........
Summary:
SGI’s "Charmian" plant is located in Blue Ridge Summit, Pennsylvania. Built in 1923, today the site employs over 150 employees. The Charmian facility contains an open pit quarry that mines meta-basalt rock.
Source:
Summary:
- subscription is required.
Corporate Filings & Presentations:
- Subscription is required.
- Subscription is required.