Subsurface and Office Representation in Mining Geology 1015 



local ordinate index values of the contained data sheets are indicated on 

 the filing tab in a manner similar to provincial file indexing. The north- 

 and east-ordinate index numbers are typed on "Fangold" gummed labels 

 which are mounted superimposed on the folder tab. These labels are ob- 

 tainable in a number of colors, and the mapping scale of the material 

 contained in the folder is indicated by the color of the index label. The 

 colors are standardized to conform with scale colors used to indicate 

 mapped areas on the 100,000' square area index maps which are mounted 

 on the regional file-index sheets. 



East-ordinate filing is in order of increasing 400' east-ordinate values 

 The tabs are staggered for purpose of visibility (fig. 536a). 



North-ordinate filing is in order of increasing 500' north-ordinate 

 values as shown in figure 536a. 



Plan data sheets are filed in order of decreasing elevation and precede 

 filing of sectional data. 



For level or elevation filing a letter-size Manila sheet is inserted so 

 that it overlies each level sheet. To this Manila sheet is attached a ^^ Y' 

 "Mak-Ur-Own" plastic index tab with typed insert indicating level or sill. 

 These tabs are obtainable in various colors. Levels of approximately the 

 same elevation in different mines are indexed with the same tab color. 

 Tabs for the various levels are staggered or offset to promote visibility 

 and the offset should be systematic and in progressive conformity with 

 elevation as indicated in figure 536b. 



A full-sized template key sheet like the one illustrated in figure 536b, 

 should be prepared to determine tab position on new level index sheets. 

 Sectional data are filed in secondary sequence in the same folder with the 

 corresponding plan-area sheets. 



Orientation classification is accomplished by index-tabbed Manila 

 divider sheets separating the various sectional data which are filed in the 

 following sequence: 



Horizontal or Composite Projections. 

 Longitudinal Vertical Projections. 

 North-South Ordinate Sections. 

 East- West Ordinate Sections. 

 Diagonal Sections. 



Sectional classification is typed on gummed labels and superimposed 

 on the Manila divider-sheet tabs. 



The sub-filing within each sectional classification is in order of de- 

 creasing vertical interval. Plastic-tabbed index sheets (described under 

 "level indexing"), separate sectional data of different vertical intervals. 

 The position and tab color are determined by the level-elevation template 

 sheet previously illustrated. The sectional data are again sub-filed in 

 order of increasing north- or east-ordinate value of the section plane. 



The following information is recorded on overlay sheets: assay. 



