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Lignite is formed during

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Which stoping method is most suitable for narrow, steep ore veins? Match the following: 1. Thickseam Extraction a. Double Unit Face 2. Bord and Pillar Extraction b. Jet Pearcing 3. Longwall Face Development c. Inclined Slicing 4. Hydraulic Mining d. Half Moon If the roof is moderate strength, artificially supported; tabular arid steep deposit the method employed is . . . . . . . . The lag of ignition of CH 4 is increase with Streak colour of Galena