| Deposit ID | 10069814 |
|---|---|
| MRDS ID | W007520 |
| Record type | Site |
| Current site name | Palabora Carbonatite Mine |
| Alternate or previous names | Palabora Mining Company Limited |
| Geographic coordinates: | 31.13472, -23.99667 (WGS84) |
|---|---|
| Elevation | 457 |
| Relative position | NEAR WESTERN BOUNDARY OF KRUGER NATIONAL PARK, NORTH OF OLIFANT AND SELATI RIVERS. 6.4 KILOMETERS SOUTH OF PHALABORWA TOWNSITE. |
Political divisions (FIPS codes)
South Africa(country)
Africa(continent)
Land(continent)
| Country |
|---|
| South Africa |
| Commodity | Importance |
|---|---|
| Copper | Primary |
| Vermiculite | Primary |
| Iron | Primary |
| Uranium | Primary |
| Aluminum Critical | Tertiary |
| Potassium | Tertiary |
| Titanium, Metal Critical | Tertiary |
| Thorium | Tertiary |
| Phosphorus-Phosphates | Secondary |
| Hafnium Critical | Secondary |
| Materials | Type of material |
|---|---|
| Apatite | Ore |
| Bornite | Ore |
| Bravoite | Ore |
| Chalcocite | Ore |
| Chalcopyrite | Ore |
| Chrysocolla | Ore |
| Copper | Ore |
| Covellite | Ore |
| Cubanite | Ore |
| Cuprite | Ore |
| Galena | Ore |
| Ilmenite | Ore |
| Linnaeite | Ore |
| Magnetite | Ore |
| Malachite | Ore |
| Marcasite | Ore |
| Millerite | Ore |
| Pentlandite | Ore |
| Pyrite | Ore |
| Pyrrhotite | Ore |
| Sphalerite | Ore |
| Tetrahedrite | Ore |
| Calcite | Gangue |
| Chondrodite | Gangue |
| Diabase | Gangue |
| Dolomite | Gangue |
| Mica | Gangue |
| Olivine | Gangue |
| Phlogopite | Gangue |
| Result | IN GENERAL 0.50-0.65% CU. PLATINOID CONTENT RUNS 7 MG/T IN ORE WITH PT/PD RATIO OF 0.69. COMPOSITION OF PLATINOIDS: 40% PT, 58% PD, 0.8% RH, 0.5% AU, 0% IR AND OS. |
|---|
| Host or associated | Associated | ||||
|---|---|---|---|---|---|
| Rock type | Metamorphic Rock > Gneiss | ||||
| |||||
| Host or associated | Host |
|---|---|
| Rock type | Plutonic Rock > Carbonatite, Intrusive |
| Host or associated | Host |
|---|---|
| Rock type | Metamorphic Rock > Gneiss |
| (1) | 31.13472, -23.99667 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Pyroxenite, Syenite And Carbonatite Intrusives In Granite-Gneissic Host Rocks |
| Type of structure | Local |
| Structure description | 'Palabora Complex,' An Intrusive Near-Vertical Pipe Composed Largely Of Pyroxenite. |
| General form | RING STRUCTURE |
|---|---|
| Strike | N75DEG W |
| Dip | 80DEG SW |
| Thickness | 100M |
| Length | 1370M |
| Width | 760M |
| Depth to bottom | 900M |
| Development status | Producer |
|---|---|
| Commodity type | Both |
| Deposit size | Large |
| Significant | No |
| Discovery year | 1912 |
| Discoverer | Dr. Hans Merensky |
| Year of first production | 1965 |
| District name | Phalaborwa Area, Letaba District, N.Eastern Transvaal |
|---|
| Type | Operator |
|---|---|
| Owner | Palabora Mining Co. Ltd. Ownership Distribution: |
| Type | Operator |
|---|---|
| Owner | Newmont Mining Corp. |
| Interest | 30.7 |
| Type | Operator |
|---|---|
| Owner | Rio Tinto Zinc (Rtz) |
| Interest | 39 |
| Type | Operator |
|---|---|
| Owner | Amax Inc. |
| Interest | 9.3 |
| Type | Operator |
|---|---|
| Owner | U.S. Public Direct |
| Interest | 4.3 |
| Type | Operator |
|---|---|
| Owner | Union Corp. Selection Trust And Selftrust |
| Interest | 4.1 |
| Type | Operator |
|---|---|
| Owner | South Africa Public Direct |
| Interest | 3.9 |
| Type | Operator |
|---|---|
| Owner | Sanlam |
| Interest | 2.9 |
| Type | Operator |
|---|---|
| Owner | Old Mutual |
| Interest | 2.9 |
| Year | 1964 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | P | ||||||||||||||
| Accuracy | Estimate | ||||||||||||||
| Description | Ap_Grade: ^.56 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1964 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | VRM | ||||||||||||||
| Accuracy | Estimate | ||||||||||||||
| Description | Ap_Grade: ^Magnetite With 5% Tio2 | ||||||||||||||
| |||||||||||||||
| Year | 1965 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | CON CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^35.64 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1965 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ORE | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^0.52 % Cu. | ||||||||||||||
| |||||||||||||||
| Year | 1965 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^99.48 % Cu. (Incl. 19,518 Tons From Other Source Ores) | ||||||||||||||
| |||||||||||||||
| Year | 1966 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | FE | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^36.72 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1966 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ORE | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^ 1.10 % Tio2 | ||||||||||||||
| |||||||||||||||
| Year | 1966 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | OVB VRM | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^65.8 % Fe | ||||||||||||||
| |||||||||||||||
| Year | 1967 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | FE | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^33.30 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1968 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | VRM | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^99.26 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1968 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ORE | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^.78 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1968 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^33.47 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1969 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | CON CU | |||||||||||||||||||||
| Accuracy | Accurate | |||||||||||||||||||||
| Description | Ap_Grade: ^67. % Fe, .75 % Tio2 | |||||||||||||||||||||
| ||||||||||||||||||||||
| Year | 1969 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ? | ||||||||||||||
| Description | Ap_Grade: ^99.30 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1970 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | VRM | |||||||||||||||||||||
| Accuracy | Accurate | |||||||||||||||||||||
| Description | Ap_Grade: ^66.1 % Fe, .88 % Tio2 | |||||||||||||||||||||
| ||||||||||||||||||||||
| Year | 1970 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ORE | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^.60 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1970 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | OVB VRM | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^33.23 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1970 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^99.49 % Cu, Incl. 4313 T. From Other Source Ores. | ||||||||||||||
| |||||||||||||||
| Year | 1971 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ? | ||||||||||||||
| Description | Ap_Grade: ^.54 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1971 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ? | ||||||||||||||
| Description | Ap_Grade: ^33.83 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1971 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ? | ||||||||||||||
| Description | Ap_Grade: ^99.50 % Cu, Incl. 4960 T. From Other Source Ores. | ||||||||||||||
| |||||||||||||||
| Year | 1972 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ? | |||||||||||||||||||||
| Description | Ap_Grade: ^66.6 % Fe, .92 % Tio2 | |||||||||||||||||||||
| ||||||||||||||||||||||
| Year | 1972 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ? | ||||||||||||||
| Description | Ap_Grade: ^99.49 % Cu, Incl. 7664 T. From Other Source Ores. | ||||||||||||||
| |||||||||||||||
| Year | 1974 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | OVB VRM | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^Apatite With Grade Of 36.4% P2o5 | ||||||||||||||
| |||||||||||||||
| Year | 1974 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | OVB CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^35.19 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1974 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ORE | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^.56 % Cu | ||||||||||||||
| |||||||||||||||
| Year | 1974 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^99.49 % Cu, Incl. 21784 T. From Other Source Ores. | ||||||||||||||
| |||||||||||||||
| Year | 1976 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^0.49% Cu | ||||||||||||||
| |||||||||||||||
| Year | 1976 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ORE | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^99.52% Cu | ||||||||||||||
| |||||||||||||||
| Year | 1978 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | CON CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^99.45% Cu | ||||||||||||||
| |||||||||||||||
| Year | 1978 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ? | ||||||||||||||
| Description | Ap_Grade: ^67.3% Fe | ||||||||||||||
| |||||||||||||||
| Year | 1979 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | OVB CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^0.51% Cu | ||||||||||||||
| |||||||||||||||
| Year | 1979 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | U | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^35.95% Cu | ||||||||||||||
| |||||||||||||||
| Year | 1980 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | OVB CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^99.47% Cu | ||||||||||||||
| |||||||||||||||
| Year | 1980 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ZR | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^0.50% Cu | ||||||||||||||
| |||||||||||||||
| Year | 1980 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | SLF | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^36.50% Cu | ||||||||||||||
| |||||||||||||||
| Year | 1980 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ZR | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^ 0.90% T1o2 | ||||||||||||||
| |||||||||||||||
| Year | 1982 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | CON CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^35.70% Cu | ||||||||||||||
| |||||||||||||||
| Year | 1982 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^ 1.24% Ti02 | ||||||||||||||
| |||||||||||||||
| Year | 1982 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ORE CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^67.1% Fe | ||||||||||||||
| |||||||||||||||
| Year | 1983 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^ 1.09% Ti02 | ||||||||||||||
| |||||||||||||||
| Year | 1983 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ORE CU | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^67.1% Fe | ||||||||||||||
| |||||||||||||||
| Year | 1983 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | ORE VRM | ||||||||||||||
| Accuracy | Accurate | ||||||||||||||
| Description | Ap_Grade: ^100% H2s04 | ||||||||||||||
| |||||||||||||||
| Year | 1984 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | 1966-1984 | ||||||||||||||
| Material | CU | ||||||||||||||
| Description | Cp_Grade: ^99.46% Cu | ||||||||||||||
| |||||||||||||||
| Year | 1984 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | 1965-1984 | ||||||||||||||
| Material | ORE VRM | ||||||||||||||
| Description | Cp_Grade: ^99.46 % Cu Wtd Ave | ||||||||||||||
| |||||||||||||||
| Year | 1984 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Period | 1965-1984 | ||||||||||||||
| Material | ORE CU | ||||||||||||||
| Description | Cp_Grade: ^0.57 % Cu | ||||||||||||||
| |||||||||||||||
| Type | In-situ | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1967 | ||||||||||||||
| Total resources | 17687000mt ore | ||||||||||||||
| |||||||||||||||
| Type | In-situ | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1964 | ||||||||||||||
| Total resources | 45351000mt ore | ||||||||||||||
| |||||||||||||||
| Type | In-situ | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1967 | ||||||||||||||
| Total resources | 15000mt ore | ||||||||||||||
| |||||||||||||||
| Type | In-situ | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1976 | ||||||||||||||
| Total resources | 526000000mt ore | ||||||||||||||
| |||||||||||||||
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | W007520 |
PALABORA ANNUAL REPORTS: 1974, 1975
PHALABORWA REPORT
LEAFLET-PALABORA MINING COMPANY LIMITED
LOMBAARD AND OTHERS, 1964, GEOLOGY SOC. SOUTH AFRICA, ORE DEPOSITS, V. II, P. 315-317.
COUSINS AND VERMAAK, 1976, ECONOMIC GEOLOGY, V. 71, P. 287-305.
LIST OF WORKING MINES IN REPUBLIC OF SOUTH AFRICA, 1968: SOUTH AFRICA DEPT. MINES, GEOLOGICAL SURVEY, NO. 18, SUPPL., P. 1.
ENGINEERING AND MINING JOURNAL, 1977, PALABORA: MAY.
VERWOERD, 1967, GEOLOGICAL SURVEY HANDBOOK SOUTH AFRICA NO. 6.
ENGINEERING AND MINING JOURNAL, 1967, PALABORA BULLETIN K8-B32: ENGINEERING AND MINING JOURNAL, NOVEMBER 1967.
INDUSTRIAL OUTLOOK REPORTS, 1974, MINERALS: CERP B-429, 1974, 1975.
PALABORA ANNUAL REPORT, 1980 ; PALABORA ANNUAL REPORT 1977 ; PALABORA ANNUAL REPORT 1979 ; PALABORA MINING COMPANY LIMITED ANNUAL REPORT 1981 ; PALABORA MINING COMPANY ANNUAL REPORT - 1983 ; PALABORA ANNUAL REPORT - 1985 ; PALABORA ANNUAL REPORT-1986 ; PALABORA MINING COMPANY ANNUAL REPORT - 1984 ; PALABORA MINING COMPANY ANNUAL REPORT. - 1982 ; PALABORA ANNUAL REPORT 1980 ; PALABORA ANNUAL REPORT 1978 ; PALABORA COMPANY REPORT 1976
VERWOERD, 1967
| Subject category | Comment text |
|---|---|
| Deposit | LENGTHS ARE FOR COPPER ZONE ONLY. N. PAGE (U.S. GEOLOGICAL SURVEY) REPORTED A MAXIMUM LENGTH OF 4000 FT, WIDTH 2000 FT, AND DEPTH OF 3500 FT FOR ENTIRE CARBONATITE COMPLEX. |
| Deposit | THIS RECORD INCLUDES DATA FROM DUPLICATE RECORDS M046564 AND M047040 WHICH HAVE BEEN DELETED FROM MRDS. |
| Deposit | INFORMATION MERGED FROM RECORD NUMBER W007949 ; W007950 ; W007951 ; W007952 ; W007953 ; W007954 ; W007955 ; W007956 ; W027510 ; W028265 ; W028664 ; W028665 ; W030775 ; W032249 ; W033017 ; W033173 ; W033820 ; W044588 ; W055344 |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-DEC-1976 | Sweetwood, Charles W. | Department of State | |
| Updater | 01-AUG-1977 | Sweetwood, Charles W. | Department of State | |
| Updater | 01-OCT-1978 | Sweetwood, Charles W. | Department of State | |
| Updater | 01-MAY-1980 | Sweetwood, Charles W. | Department of State | |
| Updater | 01-JUL-1981 | Mccarter, Lorna D. | Department of State | |
| Updater | 01-JUL-1982 | Mccarter, Lorna D. | Department of State | |
| Updater | 01-JUL-1983 | Mccarter, Lorna D. | Department of State | |
| Updater | 01-JUN-1984 | Mccarter, Lorna D. | Department of State | |
| Updater | 01-MAY-1985 | Mccarter, Lorna D. | Department of State | |
| Updater | 01-MAY-1986 | Mccarter, Lorna D | Department of State | |
| Updater | 01-JUL-1987 | Mccarter, Lorna D. | Department of State |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.
MRDS records operators as of each record's last update (≤ 2019). Some of the operators listed here have since changed hands or dissolved:
Curated by qvyshift.com from publicly-reported M&A activity (SEC filings, press releases, USGS Mineral Yearbooks). Not authoritative — verify against primary sources before relying on it. The MSHA panel above is the current authoritative source for actively-permitted mines.