Timbering in stopes ranges from occasional light props or stubs to temporarily support patches of unsafe ground to regular timbering with square sets and large bulkheads or “cribs” of solid timbers. Regular stull timbering has been mentioned. Figure 94 shows this type of timbering in a narrow, steep-dipping vein. Figure 116 shows regular stub timbering … Read more
When selecting a square-set design, one should adopt the design having the fewest number of saw-cuts but still providing the maximum support. An excessive number of cuts adds little to the strength of the set, and makes erection difficult. Furthermore, it is difficult to get even contact and bearing between the many faces. (In fact, … Read more
No matter how limited their extent, few underground mining operations progress very far without requiring some sort of support. This Bulletin presents discussion and sketches as a guide for designing underground support of timber, concrete, or steel in relatively shallow workings. Because timber will satisfy most support requirements, this discussion offers methods for supporting drifts, … Read more