1032 



Subsurface Geologic Methods 



covered so that visibility is entirely obscured, the lagging symbol is sub- 

 stituted for the lithic representation. Where partially lagged, the lagging 

 symbol is superimposed on the lithic representation (fig. 543) . This 

 method facilitates later evaluation of the degree of visibility and consequent 

 validity of data. 



Structure Attitude — Attitudes are indicated adjacent to, but outside 

 of, the lithic representation area. Attitudes are indicated by dip symbols 

 appended directly to strike representations extended y^' from the excava- 

 tion boundary (fig. 543). 



Excavation Data — An area ^^ 

 ary, is set aside for excavation and cultural data. Lateral stoping extent. 



area -74 wide, y^' from the excavation bound- 



1/2 

 1/4 



Descriptive Side Notes 

 ,n T" "Excayat ioh"^ata 



1/8"- 



2"- 



iLitholoRY . 

 . Aiiltiidfi 



Descript^ . 

 Side Notes 



_A_ssays 





Figure 543. Note sheet and office-map posting specifications. 



raise location, and level-to-level vein inclination (where determined by 

 stopes and raises) are indicated on plan. 



Side Notes — ^All descriptive side notes, whether they refer to geology, 

 excavation, or engineering, are posted in lY' wide area, Y' from the 

 excavation boundary. Sides notes are necessary to indicate detail not 

 graphically or colorimetrically mappable. Side notes are lettered neatly 

 in lower-case as small as legibility will permit; they must be brief and 

 descriptive. If the mapping is skillful, an auxiliary-data-recording book is 

 unnecessary; all data is recorded on the field-note sheet. To conserve 

 space on field sheets and office maps, all side-note descriptions and lines 

 indicating described points are oriented parallel to either east-west or 

 north-south oridinate lines rather than at right angles to the mine excava- 



