| Rock in a seam | 14 |
| Rock hound's find, perhaps | 30 |
| Rock formation? | 15 |
| Rock enjoyed by metal fans? | 27 |
| Rock bands, possibly? | 21 |
| Riches from ditches | 19 |
| Return on a deposit? | 20 |
| Resource in the game Settlers of Catan | 38 |
| Refinery stuff | 14 |
| Refinery shipment | 17 |
| Refinery material | 17 |
| Refiner's supply | 20 |
| Quarry find | 11 |
| Pyromorphite, e.g. | 18 |
| Pyrometallurgists treat it | 26 |
| Pyrites, e.g. | 13 |
| Pyrite or mispickel | 19 |
| PST st. | 7 |
| Prospectors might find it | 25 |
| Prospector's yield | 22 |
| Prospector's prospect | 25 |
| Profitable rock extraction | 26 |
| Profitable extraction | 21 |
| Prill or stibnite | 17 |
| Prill or pyrite | 15 |
| Prill or bauxite | 16 |
| Prill is one | 12 |
| Precious metal source | 21 |
| Potential pay dirt | 18 |
| Portland's state: Abbr. | 27 |
| Portland's st. [avxwords.com now has archived bundles - just $8/year] | 73 |
| Pitchblende or wulfenite | 24 |
| Piece-of-mine? | 14 |
| Piece of mine | 13 |
| Pickax picking | 14 |
| Penny : pound :: ___ : krone | 28 |
| Pay dirt? | 9 |
| Pay dirt for a miner | 20 |
| Parts of a krona | 16 |
| Part of the underground economy? | 32 |
| Panner's quest | 18 |
| Paco, e.g. | 10 |
| Pacific st. | 11 |
| One of Earth's treasures | 28 |
| Object of stoping | 17 |
| Nugget source | 13 |
| Nothing could be finer to a miner | 33 |
| Norwegian wherewithal | 21 |
| No ordinary rock | 16 |
| Nickel in a pocket, say? | 24 |
| Nickel in a pocket, perhaps? | 28 |
| Neighbor of Cal. | 16 |
| Natural product | 15 |
| Natural mineral | 15 |
| Mt. Bachelor's home | 23 |
| Mountain treasure | 17 |
| Mother lode material | 20 |
| Money in Denmark or Sweden | 26 |
| Mispickel or pyrite | 19 |
| Mispickel or ocher | 18 |
| Mispickel or cinnabar, e.g. | 27 |
| Mispickel or bauxite | 20 |
| Mispickel is one | 16 |
| Minnesota shipment | 18 |
| Mining matter | 13 |
| Miners' strike | 18 |
| Miners' gathering | 21 |
| Miners dig this | 15 |
| Mineral-bearing rock | 20 |
| Mineral resource | 16 |
| Mineral quest | 13 |
| Mineral in the raw | 18 |
| Mineral in a wall, perhaps | 26 |
| Mineral bearing rock | 20 |
| Mineral bearing rock | 23 |
| Miner's quarry? | 19 |
| Miner's objective | 21 |
| Miner's metal | 17 |
| Miner's haul | 16 |
| Miner's discovery, perhaps | 30 |
| Miner's concern | 19 |
| Mined over matter? | 18 |
| Mined item | 10 |
| Mine-car load | 13 |
| Mine-car contents | 17 |
| Mine removal | 12 |
| Mine production | 15 |
| Mine deposit | 12 |
| Mine content | 12 |
| Mine car cargo | 14 |
| Millerite, e.g. | 15 |
| Mill shipment | 13 |
| Metals source | 13 |
| Metallurgy sample | 17 |
| Metallurgy material | 19 |
| Metallic rock found in veins | 28 |
| Metal to be refined | 19 |
| Metal in the raw | 16 |
| Metal in a mountain | 19 |
| Metal carrier | 13 |