Influences of Water Vapor on Roof Fall Accidents in Selected Underground Coal Mines in Malawi

Figure 11

Microscopic images of Kaziwiziwi conglomerate (a, b, c, d) and Kaziwiziwi carbonaceous sandstone (e, f, g, h). GR: granites; MX: matrix; Mus: muscovite; Il: illite; Spl: sphalerite; Chl: chlorite; Py: pyrite; COL: coal. Widths of the images are 6.0 mm for (a) and (b); 1.2 mm for (c) and (d); 0.60 mm for (e) and (f); and 2.5 mm for (g) and (h).