EXPLORATION GEOLOGY (EXPLO PROPER) Flashcards
Surface Guides
- Favorable Strat and Host Rocks
- Weathering and Leaching
- Ancient Mining and Smelting
- Shear Zones
- Lineament
Most suitable target for Cr-Ni-Pt-Cu
Archean/Proterozoic
LMI
Best and most significant surface signature for a base-metal exploration Guide
Gossans
What are Gossans
Yellow or Red Colored Iron Oxide Rich Zones
Oldest Zinc Smelting Site
Zawar
the result of a huge volume of rock deformation due to intense regional stress typically in the zones of subduction at depths down to a few Km
Shear Zones
What type of ores usually occurs at shear zones?
Syngenetic or epigenetic Hydrothermal
Characteristics of ores or rocks in Shear zones
Metasomatized and often display retrograde metamorphism assemblage
A record of geological facts, occurrence or rocks in space, and their contact, weathering effects such as leaching or gossan, anfd structure in their correct space relation
Geologic Map
Maps that are prepare by taking traverse on the surface at various intervals and plotting records like rock types, contancts and all other observatons inclusing strike and Dop
Surface Map
Maps that are used to select boundaries for a reconnaissance exploration and represents overall regional picture
Regional Scale Surface Map
Features highlighted in a Regional Map
Geomorphology and Draianage Pattern
Scale of Regional Map
1:50K- 1:250K
What type of sampling are employed at regional scale?
Soil, Grab, and Rock chip Samples of Rocks and weathered profiles
Represents a part of the regional map having cluster of deposits and recorded with closely spaced traverses and rock/Soil sampling use to selecr area for prospecting
District/Belt Scale Map
Scale of Belt or District Map
1:25K - 1:10K
What features are highlighted in Belt or District Map?
Strat, Lithology, Detailed Structures, Surface Mineralizaion and Ancient mining if avaiable
Scale of a deposit Map
1:5K - 1:1K
Purpose of a deposit Map?
Helps in designing a drilling program to delineat minerals or ore bodies, detailed surface geol features, extent of deposits, location of trenches, pits, and borehols and draw sections along and across elongation of mienralization
scale of Underground Maps?
1:200 or 1:50
Goal of Regional Scale Exploration
Synthesis of all available data and concepts in order to delineate area for reconnaisance while the resource is of a preliminary nature
Activities in Regional Scale Exploration
Aerial Geophysics
Broad Based Geochem
Ground Check
Wide Spaced Soil and Rock Chip Sample
Pitting, Trenching
Few Scout Drillings
Demarcation of Priority and Ranking of Targets
Deliverables at Regional Scale Exploration
Work Plan
Preparation of Org Plan
Exploration Scheme with Fund Allocation
Budgeting, Time Scheduling to achieve Specific Objectives
Activties at District Scale exploration
Identification of type of exploration methods, time and fund recquirements
Geologic Mapping of Target Areas
Recognition of surface signatures like weathering and Alteratinos, Identification of Host Rocks and Sturctureal settings and control
Ground Geophysics and Geochem
Delineation of porved and Probable reserves
Deliverables at Local Scale Exploration
Scoping Study, Prefeasibi Study and Feasib Study
