Data / Mines / Northern Mariana Islands
Mines in Northern Mariana Islands: 8 open mines
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
MSHA lists 8 open mines in Northern Mariana Islands, run by 7 operators and employing 135 people. Since January 1, 2022 its inspectors issued 0 citations and orders there with $0 in proposed penalties, and operators reported no injury or illness cases. The operators with the most open mines are Hawaiian Rock Products; Construction and Material Supply Inc; Gppc, Inc. Data from MSHA, November 6, 2026.
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- Open mines
- 8
- Operators
- 7
- Employees
- 135
- Active
- 8
- Citations and orders since January 1, 2022
- 0
- Inspections
- 3
- Inspector hours on site
- 3
- Citations per inspection
- 0.00 (all mines 2.30)
- Accident reports
- 0
- Injury and illness cases
- 0
- Fatalities
- 0
- Latest MSHA record
- February 28, 2026
Operators with the most open mines in Northern Mariana Islands
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| Hawaiian Rock Products | 2 | 76 | 0 | $0 | 0 |
| Construction and Material Supply Inc | 1 | 5 | 0 | $0 | 0 |
| Gppc, Inc | 1 | 30 | 0 | $0 | 0 |
| J-G Sablan Rock Quarry | 1 | 4 | 0 | $0 | 0 |
| Resources Management International Corporation | 1 | 4 | 0 | $0 | 0 |
| Success International Corporation | 1 | 8 | 0 | $0 | 0 |
| USA Fanter Corp., Ltd. | 1 | 8 | 0 | $0 | 0 |
Mines with the most citations
Open mines, ranked by citations and orders since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Obyan Quarry | Hawaiian Rock Products | Northern Islands County, MP | Construction sand and gravel | 70 | 0 |
| Obyan Staging Area | Gppc, Inc | Saipan County, MP | Construction sand and gravel | 30 | 0 |
| USA Fanter Corp., Ltd. | USA Fanter Corp., Ltd. | Northern Islands County, MP | Construction sand and gravel | 8 | 0 |
| New Hope Quarry | Success International Corporation | Saipan County, MP | Construction sand and gravel | 8 | 0 |
| Fpa Marpo Quarry | Hawaiian Rock Products | Tinian County, MP | Construction sand and gravel | 6 | 0 |
| CMS Quarry 1 | Construction and Material Supply Inc | Saipan County, MP | Crushed, broken stone | 5 | 0 |
| J-G Sablan Rock Quarry | J-G Sablan Rock Quarry | Saipan County, MP | Crushed, broken stone | 4 | 0 |
| Rmic Quarry Saipan | Resources Management International Corporation | Saipan County, MP | Construction sand and gravel | 4 | 0 |
Counties
| County | Open mines |
|---|---|
| Saipan County | 5 |
| Northern Islands County | 2 |
| Tinian County | 1 |
Mines by kind
| Kind | Open mines |
|---|---|
| Sand and gravel | 6 |
| Stone | 2 |
Main commodities
| Main commodity | Open mines | Share |
|---|---|---|
| Construction sand and gravel | 6 | 75% |
| Crushed, broken stone | 2 | 25% |
US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.