Possible Clues:

• Coca leaf assortment? Collier may take his pick here
• Officer coming across a fine hole in one exposed seam
• At which miner works
• Where the real work takes place!
• Where the action is - in a mine?
• At the - - , directly involved with production
• See 9
• Firm with gangster to look at where all the essential work is done
• Female expert adds fuel to the fire, to begin with, where Labour is doing the most work, practically speaking
• Large female wearing short coat, one exposed seam that's cut