INTEGRATING REMOTE SENSING, TERRAIN MODELING AND SPATIAL ANALYSIS TO ENHANCE EXOTIC COPPER EXPLORATION

Exotic copper mineralization (Cu-oxide) is observed in drainage networks leading away from porphyry copper deposits. Exotic copper deposits are economically favorable exploration targets, easily and cheaply processed, environmentally benign and proximal to existing mine infrastructure. By integrating techniques in Remote Sensing/Image Processing, 3D terrain analysis and GIS spatial analysis within the knowledge base of exotic copper deposit genesis a model is developed to guide exploration for these resources. Data integrated within this analysis includes Multispectral Imagery (Landsat TM/7), Digital Elevation Models (GTOPO30, SRTM) and regional vector structure layers. All are readily available from the public domain (USGS). The key genetic components of an exotic copper deposit are source regions, transport pathways, deposits (sinks) and preservation. This model identifies, analyzes and assesses each component within the context of exotic copper deposit genesis: SOURCE: Generally the source is a known porphyry deposit or known porphyry exploration target. Multispectral satellite imagery will identify a Fe-rich gossen or leached capping indicating a Cu-sulfide source. Knowledge of the regional geology will place the source in a geochronologic framework and verify it's susceptibility to major weathering events in the Miocene. TRANSPORT PATHWAYS: Existing regional geologic mapping will identify regional structures assumed to control fluid transport. Lineaments are identified from the DEM and the satellite imagery. A general 'transport' pathway trend is integrated into the model. DEPOSITS: The deposits (sinks) are the results of the modeling effort and the eventual targets. Using GIS to enforce constraints or rules, derived from the knowledge base, will narrow these targets. Constraints include a maximum distance from the source, a location coincident with the 'transport' pathways and mineralogy of the host rock. PRESERVATION: The DEM and multispectral imagery are used to assess the current geomorphic environment for potential of deposit preservation. Due to the recent availability of global public domain datasets, this technique can create quick and inexpensive initial exploration targets. Further exploration efforts including a Mass Balance Analysis and field mapping will refine the exotic targets further.