KYANITE AND RELATED MINERALS 



311 



countries. Probably some of these deposits will be 

 rich enough and large enough to be of potential 

 economic value, but many will be too low in grade 

 for exploitation in the next 25 years. Resources in 

 undiscovered deposits and districts in the United 

 States are doubtless enormous and may exceed our 

 identified and hypothetical resources. 



PROBLEMS FOR RESEARCH 



The information available about grade and size 

 of many deposits of the kyanite-group minerals is 

 insufficient for meaningful economic appraisals be- 

 cause the economic potential of a deposit is difficult 

 to assess by conventional geologic studies. As the 

 AlzSiOs minerals are highly resistant to weathering 

 and erosion, high-grade rock is commonly better 

 exposed than low-grade rock, and consequently a 

 deposit may appear much richer than it actually is. 

 Detailed mapping and sampling are necessary to 

 determine the extent of high-grade and low-grade 

 rock. A careful preliminary evaluation by these 

 means will be very useful to economic geologists as 

 a guide to deposits which may deserve more ex- 

 ploration. 



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