Silica dust: Mining’s invisible concern and the next test of leadership
April 21, 2026
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In Global Mining Review, Debra Johnson writes about how silica dust limits are expected to reshape mining’s safety and compliance landscape
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Walk some mine sites and you may see dust hanging in the air. For years, some have treated it as a nuisance, a housekeeping issue. Today, however, our industry understands that invisibly contained in many mine site’s dust is respirable crystalline silica—a potentially serious long-term threat to many mine workers.
The data is sobering. Silica exposure is tied to silicosis, chronic lung disease, and increased risk of lung cancer. In both coal and metal/non-metal operations, we’re seeing more aggressive disease, showing up in younger workers and progressing faster than in previous generations. This isn’t a theoretical risk buried in a regulation; instead, this is someone’s colleague, someone’s family member.
MSHA’s new silica rule is a direct response to that reality. In 2024, the agency finalized a standard that halves the permissible exposure limit for respirable crystalline silica to 50 micrograms per cubic metre of air based on an 8-hour time-weighted average, with a new action level at 25 micrograms. While effective dates for the rule have been delayed due to pending litigation, the levels themselves are subject to a specific provision in the Federal Mine Safety and Health Act of 1977 (Mine Act) that prohibits MSHA from weakening miner protections when it revises or replaces a standard.
Debra Johnson writes in Global Mining Review about how silica dust limits are expected to reshape mining’s safety and compliance landscape
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-
Debra works with mining companies to achieve and exceed their ESG, carbon neutrality and net zero goals. Based in Phoenix, she is committed to solving sustainability issues in the mining industry.
Contact Debra
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