| Deposit ID | 10100865 |
|---|---|
| MRDS ID | TC39263 |
| Record type | Site |
| Current site name | Morro Da Mina |
| Alternate or previous names | Cassipore |
| Geographic coordinates: | -51.21582, 3.21808 (WGS84) |
|---|---|
| Location accuracy | 10000(meters) |
| Relative position | 540 KM N OF MACAPA, Est +/- 10 Minutes, Est +/- 10 Minutes |
Political divisions (FIPS codes)
Amapa*(province)
Brazil(country)
South America(continent)
Land(continent)
| Country | State |
|---|---|
| Brazil | Amapa* |
| Commodity | Importance |
|---|---|
| Gold | Primary |
| Materials | Type of material |
|---|---|
| Gold | Ore |
| Bauxite | Gangue |
| Garnet | Gangue |
| Goethite | Gangue |
| Kaolinite | Gangue |
| Monazite | Gangue |
| Quartz | Gangue |
| Rutile | Gangue |
| Tourmaline | Gangue |
| Zircon | Gangue |
| Result | GOLD GRAINS (ABOUT 5 ANALYSES): 1.18 TO 2.98% AG, 4.45-7.03% PD, 4.47% PT, 0.24-0.66% ZN, 1.49% IR. FINENESS 966 TO 1000. |
|---|
| Model code | 273 |
|---|---|
| USGS model code | 36a |
| Deposit model name | Low-sulfide Au-quartz vein |
| Mark3 model number | 27 |
| Host or associated | Associated |
|---|---|
| Rock type | Metamorphic Rock > Gneiss |
| Rock unit name | Vila Nova Super Group;Vila Nova Super Group;Vila Nova Super Group;Vila Nova Super Group |
| Rock description | Vila Nova Super Group;Vila Nova Super Group;Vila Nova Super Group;Vila Nova Super Group |
| (1) | -51.21582, 3.21808 |
|---|
| Name | MORRO DA MINA |
|---|
| Development status | Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1982 |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | TC39263 |
LIMA DA COSTA, M., VIERA-COSTA, J.A., AND ANGELICA, R.S., 1993, GOLD-BEARING BAUXITIC LATERITE IN A TROPICAL RAIN FOREST CLIMATE; CASSIPORE, AMAPA, BRAZIL: CHRONIQUE DE LA RECHERCHE MINIERE, NO 510, P. 41-60
CIMRI
| Subject category | Comment text |
|---|---|
| Deposit | Discovery Year: EARLY 1980'S |
| Deposit | LATERITE PROFILE IS ABOUT 50 M DEEP AND CONSISTS OF (1) UP TO 1.2 M OF YELLOW TOP SOIL THAT CONTAINS FRAGMENTS OF DURICRUSTS AND BAUXITE, (2) ORE 5.0 M THICK IRON CONCRETION HORIZON FE-OXIDES AND HYDROXIDES WITH CLAY, QUARTZ MATRIX, (3) UP TO 6 M THICK BAUXITE HORIZON, (4) 40-45 M SAPROLITE HORIZON, CLAYEY MATERIAL, QUARTZ, FELDSPER; QUARTZ VEINS, SHISTOCITY PRESERVED. GOLD OCCURS IN HORIZONS (1) AND (2) AND RANGES FROM 0.05 TO 3.49 PPM AU, MOST VALUES GREATER THAN 1.0 PPM OCCUR IN YELLOW SOIL (39% OF THE ANALYSES). HIGHEST AU CONTENTS ARE IN THE LESS THAN 500 MICRON AND 125-63 MICRON SOIL FRACTIONS. AU PARTICLES AVERAGE 75 MICRONS, HAVE SHARP CORNERS, SMOOTH SURFACES, AND ARE COMMONLY INTERGROWN WITH QUARTZ. DEPOSIT DEVELOPED BY WEATHERING OF AU-GOLD QUARTZ VEINS IN GNEISS. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-OCT-93 | Page, Norman J. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.