Helmer Mine section and sampling. Entry Helmer Mine (N 17 W, 57°) 638 Massive cross-bedded SS, fine to medium-grained, friable some silty zones near top. 9.3 Clay bed mined out -- no section, includes silty beds, [see below] argill. 5.6 Fine gr. SS and siltstone, SS in beds up to 4" thick, partings of silty claystone. 6.7 Clay bed, main bed. 116 Light gray clay & silty clay (Sample 2) silty lemnay 119 Siltstn zone thru beds 13 gray clay brown black in lower part 22 Dk gray cl. Silt lemnay (Sample 3) 0.3 Platy siltstone. Bentonitic Clay First sandstone Prob not SS lower silt? 14 locally. Upper clay - 8 to 10' thick, gray plastic, some interbedded silt 4' from top that is 2' thick, clay is finely silty in spots. loc. argill. Siltstone: [Samples 1 random sample clay from stoppe.]