OCR Text |
Show 65 carefully checked and modified where found in error and also extended into the areas where not shown on these official maps. In general, the areal extent of the ore-bearing formation as shown by these maps is indicated with a high degree of accuracy and only minor modifications and extensions were necessary. The base of the ore-bearing formations as mapped by the procedure stated was shown on the maps "Areas containing vanadium-bearing formations of economic value Southwestern Colorado," PV-225, 1-12, which are submitted under separate cover as a part of this report, and photostatic copies of which are included within this report, (pis. 14-25, which follow page 187) and upon which the subject lands were shown also. The map "Index map showing relation of maps PV-225, 1-12, and location of vanadium mining areas of Southwestern Colorado, (pi.26) shows the area covered by each map of this series and the relation between each of these maps. Extensive geologic studies of the vanadium-bearing formations were made for the purpose of determining the limits of the known vanadium mineralization of economic value within the vanadium-bearing formations. ' Inasmuch as the vanadium-bearing formations have not yet been explored or developed to their probable eastern limit of mineralization, the eastern limit of known vanadium mineralization was conservatively determined for the purpose of this study by connecting the most eastern |