Subsurface and Office Representation in Mining Geology 



1013 



percent of subsurface data can be replaced by remapping; mine workings 

 seldom remain open long. 



Regional filing is based on 100,000' square area units. A provincial 



502E|||\ 505E ||il504E||\ 505E|[|\ 506E||[| 507£|[[\ 50£E|[|| o09E||\510e| 



301E 





Figure 535. (a) Regional east ordinate filing tab arrangement (each successive tab 

 to_ right represents increase of 100,000 feet in east-ordinate value; (6) regional 

 filing arrangement, first in order of increasing east, ordinate values and second 

 in order of increasing northing; (c) plan view of filing drawer showing ordinate 

 arrangement of index tabs; (d) manner of report indexing for filing. 



