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Bit Selection Chart

Strength of Rock Soft Medium Hard Rock Formation / Class
PSI MPA 10 20 30 40 50 60 70 80
Lower      Lower Limestone, Siltstone
2 000 14 Claystone, Mudstone, schist
4 000 28 Marl, Chalky Limestone
6 000 41 Soft - Medium Shales
8 000 55 Soft Marble, Dolomite
10 000 69 Consolidates Sandstone
12 000 83 Medium Shale, conglomerate
14 000 97 Tuff, Soft Schist
16 000 110 Andesite, Rhyolite
18 000 124 Quartzite (Sand & Silt)
20 000 138 Limestone, Marble
22 000 152 Monzonite, Granite
24 000 165 Gneiss
26 000 179 Diorite, Diabase
28 000 193 Hard Shale, Slate
30 000 207 Limestone, Dolomite
32 000 221 Basalt
34 000 234 Tactite, Skarn
36 000 248 Granodiorite
38 000 262 Taconite
40 000 276 Quartzite
42 000 290 Syenite
44 000 303 Gabbro
46 000 317
48 000 331 Banded Iron
50 000 345 Taconite
52 000 359 Chert
54 000 372 Basalt (Hard)
56 000 386 Quartzite
58 000 400
60 000 414 Amphibolite
Higher Higher Hornfels, Hematite Ore

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