30 USC § 845 - Dust standards in presence of quartz

---
identifier: "/us/usc/t30/s845"
source: "usc"
legal_status: "official_prima_facie"
title: "30 USC § 845 - Dust standards in presence of quartz"
title_number: 30
title_name: "MINERAL LANDS AND MINING"
section_number: "845"
section_name: "Dust standards in presence of quartz"
chapter_number: 22
chapter_name: "MINE SAFETY AND HEALTH"
subchapter_number: "II"
subchapter_name: "INTERIM MANDATORY HEALTH STANDARDS"
positive_law: false
currency: "119-84"
last_updated: "2026-04-17"
format_version: "1.1.0"
generator: "[email protected]"
source_credit: "(Pub. L. 91–173, title II, § 205, Dec. 30, 1969, 83 Stat. 765; Pub. L. 96–88, title V, § 509(b), Oct. 17, 1979, 93 Stat. 695.)"
---


# § 845. Dust standards in presence of quartz

In coal mining operations where the concentration of respirable dust in the mine atmosphere of any working place contains more than 5 per centum quartz, the Secretary of Health and Human Services shall prescribe an appropriate formula for determining the applicable respirable dust standard under this subchapter for such working place and the Secretary shall apply such formula in carrying out his duties under this subchapter.

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**Source Credit**: (Pub. L. 91–173, title II, § 205, Dec. 30, 1969, 83 Stat. 765; Pub. L. 96–88, title V, § 509(b), Oct. 17, 1979, 93 Stat. 695.)

## Statutory Notes and Related Subsidiaries

### Change of Name

“Secretary of Health and Human Services” substituted in text for “Secretary of Health, Education, and Welfare” pursuant to  which is classified to , Education.

### Effective Date

Section operative six months after , except to the extent an earlier date is specifically provided for in , see , set out as a note under .