Subsurface and Office Representation in Mining Geology 



1019 



sification. The sequence is identical to note-sheet filing. Assay, geochemi- 

 cal, biochemical, and vegetation data are represented on clear plastic over- 

 lay sheets, which are superimposed on the corresponding geologic plan 

 or sections. 



Legend 



The legend shown in figures 539, 540, 541, and 542 is the result of 

 eleven years of research and trial application. The objective has been sim- 

 plicity and logical, .systematic, and graphic representation of all mega- 

 scopically mappable features. Representation is the same for plan and 



IT 



7f 



If 



If 



n 



Elevation: El. 4010 

 nine Level! 5100L 



Plastic Elevation Tab 

 sevfed to piap here. 



> 



4105 

 3200L 



4230 

 3300L 



4300 

 3400L 



4106 

 3500L 



37CE000 fE02qE040fE060fE08CfE10C^ 

 4RrtI4nn JMOOiM41oJN40oJK420)N40d i 



lElev. 



Coord 



Tabs 



Coordinate !febs 



O OOOQOOOOQOOOOpOOO OQOOOOQOOOC 



)OOOOQOOOOQOOOOOOOOO 

 , . ^-. ^ ^ODOWrJttOCO 



) oo(j> CT> ojcncn 



Figure 538. Position of plastic elevation office map tabs and coordinate 

 areal-divider-Sheet filing tabs. 



section. (A plan map is a horizontal section.) Unless otherwise specified 

 the legend is the same for note sheets and office maps. 



Culture and Physiography — These features are mapped concurrently 

 with geology unless previous surveys exist. It is imperative that culture 

 and physiography be completely represented so that spatially correlated 

 geological data may be readily oriented and located. Such nongeologic 

 data are also important in planning economic development and exploiting 

 mineral deposits. 



The location, size, and composition of mine dumps, old fill, and caved 

 subsurface workings aid in determining the location, size, and composition 

 of veins in inaccessible workings. Stope or raise holings, slumps, and 

 caves help to deduce position, attitude, and economic tenor of veins. The 

 amount of timber or lagging on subsurface maps is a criterion of fault 



