Geologic information
Identification information
Deposit ID |
10056417 |
MRDS ID |
TC00089 |
Record type |
Site |
Current site name |
Lega Dembi Deposit |
Alternate or previous names |
Lega Dembi North, Lega Dembi Central, Lega Dembi South
|
Geographic coordinates
Geographic coordinates:
|
38.8345, 5.58442 (WGS84)
|
Relative position |
7 KM SW OF SHAKISO, 500 KM S OF ADDIS ABABA |
(click for info) |
Comments on the location information
- THE COORDINATES OF THE LEGA DEMBI CONCESSION AREA ARE 05-09N TO 06-13N AND 38-36E TO 39-11E.
Commodities
Commodity |
Importance |
Gold |
Primary |
Silver |
Secondary |
Comments on the commodity information
- THE ORE IS ALMOST ALWAYS SEPARATED FROM THE MARMORA GNEISS BY A TALC-TREMOLITE SCHIST LAYER. TWO TYPES OF ORE ARE RECOGNIZED: FINE TO MEDIUM-GRAINED MASSIVE, LOCALLY BRECCIATED ORE; AND BANDED SCHISTOSE ORE. FIRE-ASSAY RESULTS SHOW THAT GOLD MINERALIZATION TOOK PLACE BOTH IN QUARTZ VEINS AND IN THE COUNTRY ROCKS IN CONTACT WITH THEM.
Materials information
Materials |
Type of material |
Gold |
Ore |
Alteration
-
(Local)
Silicification Affecting Rocks On Both Sides Of The Fault.
Host and associated rocks
Host or associated |
Host |
Rock type |
Metamorphic Rock
> Metasedimentary Rock
> Quartzite |
Stratigraphic age (youngest) |
Neoproterozoic |
|
Host or associated |
Host |
Rock type |
Metamorphic Rock
> Phyllite |
Host or associated |
Host |
Rock type |
Metamorphic Rock
> Schist |
Rock unit name |
Marmora Group;Adola Group |
Rock description |
Marmora Group;Adola Group |
Host or associated |
Host |
Rock type |
Metamorphic Rock
> Gneiss |
Host or associated |
Host |
Rock type |
Metamorphic Rock
> Amphibolite |
Ore body information
General form |
QUARTZ VEIN |
Length |
2000M
|
Controls for ore emplacement
- Major Fault Separating The Marmora Group And The Adola Group