Subsurface and Office Representation in Mining Geology 



1011 



of a data sheet is 50,500 and the ordinate value of the east boundary is 

 40,800, the coordinate indexing is as indicated in figure 534a. 



It will also be recalled that it was recommended that local values be 

 derived from a provincial coordinate system. In local use the first few 

 digits are dropped and local values are limited to the last five digits. For 

 the purpose of regional indexing of geological data the regional values 

 are recombined with the local value in the manner illustrated in figure 

 534b. 



In the indexing of surface sheets the word surface is entered in the 



^ 



(Sectio n Looklnp; North 

 Plane of Sec . E-W 

 Long. Sec. Vei n Smuggler 



Figure 534. Manner of indexing field subsurface note sheets, (a) Local ordinate 

 values of east and north boundaries and elevation of mapping plane entered on 

 note sheet; (6) regional values recombined with local values; (c) longitudinal 

 projection indexing in upper left and right corners of a field subsurface note 

 sheet; (d) cross-section location, orientation, and filing index data entered on 

 a note sheet. 



