| Metal bearing rock | 18 |
| Mesabi shipment | 15 |
| Mesabi matter | 13 |
| Material in seams and pockets | 29 |
| Material found at diggings | 26 |
| Material for some mills | 23 |
| Malachite | 9 |
| Magnetite or cinnabar | 21 |
| Magnetite or beryl | 18 |
| Magnesium source | 16 |
| Lucky rockhound's find | 26 |
| Lode's load | 15 |
| Lode yield | 10 |
| Lode stuff | 10 |
| Lode output | 11 |
| Lode ingredient | 15 |
| Lode find | 9 |
| Lode component | 14 |
| Lithium source | 14 |
| Lead or copper, e.g. | 20 |
| Lead from a mountain? | 21 |
| Krone part | 10 |
| Krona division | 14 |
| Klondike find, perhaps | 22 |
| Klondike enticement | 19 |
| Klondike discovery | 18 |
| Kind of strike applauded by mine owners | 39 |
| Kind of Minecraft block | 23 |
| Japanese group ___SkaBand | 25 |
| Its processing produces slag | 28 |
| ItÂ’s mined and refined | 26 |
| It's totally unrefined | 26 |
| It's S of Wash. | 19 |
| It's refined | 16 |
| It's picked out of a mine | 29 |
| It's often an oxide | 23 |
| It's moved through adits | 28 |
| It's mined off one's lode | 33 |
| It's lode-bearing | 21 |
| It's in some people's veins | 35 |
| It's found in a vein | 24 |
| It's fine for a refinery | 28 |
| It's discovered in veins | 28 |
| It's crude | 14 |
| It's all in your mine | 25 |
| It's all in vein | 20 |
| It usually ends in "ite" | 34 |
| It passes through adits | 23 |
| It might hold gold | 18 |
| It might be picked apart | 24 |
| It might be moved on a bucket conveyor | 38 |
| It might be found in a rush | 27 |
| It may contain mercury | 22 |
| It may be sought in a rush | 26 |
| It may be refined | 17 |
| It may be reached by tunnel | 27 |
| It may be picked out of a pocket | 32 |
| It may be measured in assay tons | 32 |
| It may be in a bed | 18 |
| It may be found in a pocket | 27 |
| It may be deep in a mine | 24 |
| It gets refined | 15 |
| It could use some refinement | 28 |
| It can be picked out | 20 |
| Iron or gold source | 19 |
| Iron locale | 11 |
| Iron container | 14 |
| Intake at Bethlehem | 19 |
| Ilmenite, for one | 17 |
| Ida's partner? | 18 |
| Hopper load | 11 |
| Heavy-metal rock? | 17 |
| Hard rock, maybe | 16 |
| Hard rock component | 19 |
| Groundbreaking stuff? | 21 |
| Groundbreaking discovery | 24 |
| Ground-breaking discovery? | 26 |
| Ground-breaking discovery | 25 |
| Graphite, e.g. | 14 |
| Graded material | 15 |
| Good source of iron? | 20 |
| Gold Rush quest | 15 |
| Gold or silver source | 21 |
| Gold in them thar hills? | 24 |
| Gold digger's quest? | 24 |
| Gold digger's aim | 21 |
| Gold container, perhaps | 23 |
| Gold container, maybe | 21 |
| Get a lode of it | 16 |
| Genesis of steel | 16 |
| Gary intake | 11 |
| Garnierite, for nickel | 22 |
| Galena. | 7 |
| Galena or stibnite | 18 |
| Galena or feldspar | 18 |
| Galena or cinnabar, e.g. | 24 |
| Galena e.g. | 12 |
| Furnace input | 13 |
| Fruit of a miner's labor | 28 |
| Forty-niner's score | 23 |