http://www.spiderresources.com - In this presentation by Spider Resources Board of Directors member Dr. James Franklin, P.Geo. explains the importance of Chromite in today's world
8. Step 1: Melting in the upper mantle, melt rises to form a magma pool , 5 -10 km below the earths surface Step 2: Melt begins to cool, precipitating mg-rich minerals (olivine, pyroxene) and chromite Step 3: Crystals settle to the bottom of melt chamber, forming layers Step 4; magma is recharged many times, forming multiple layers
9. Chromite forms distinct layers, but how does it accumulate without olivine or pyroxene? Need to stop silicate precipitation but continue chromite accumulation. How does this happen?
16. Some Important Statistics Price began to vary in the 1980’s, in response to economic conditions In the past 10 years, rapid price increases caused by demand in China and India Production has increased dramatically; large reserves in South Africa, Kazakhstan and India sufficient to meet demand BUT…. Abilities of major suppliers to produce more are largely dependant on power availability; already limited in all three large producers Consumption per person has doubled in 50 years; industrialization of large nations drives this
17.
18.
19.
20. Magnetics Help Define Geology Ultramafic rocks have high magnetic susceptibility pattern (dark red)
21. Geological Interpretation From geophysical and drill data, a preliminary geological map outlines the distribution of key target rocks- the ultramafics- that host Cr and Ni occurrences
22. Cross-section: Big Daddy Deposit Note the exceptional continuity of the chromite zone to depth It occurs at a very distinct change in rock type (peridotite and pyroxenite) This came abut because during cooling, the precipitation of silicate minerals was interrupted by melt contamination This contamination enabled chromite to accumulate without dilution