| Underground-railroad cargo | 26 |
| Underground wealth | 18 |
| Underground find | 16 |
| Underground discovery | 21 |
| Underground asset | 17 |
| Tram's haul | 15 |
| Tram's cargo | 16 |
| Tram cargo, perhaps | 19 |
| Tram car filler | 15 |
| Tram car contents | 17 |
| Tinstone or bauxite | 19 |
| This really smelts! | 19 |
| The gold in them thar hills, say | 32 |
| The Douglas fir is its state tree: Abbr. | 40 |
| The Douglas fir is its state tree (abbr.) | 41 |
| The Decemberists' home state, for short | 43 |
| The Columbia R. forms part of its border | 40 |
| The Columbia R. forms much of its northern border | 49 |
| Tantalite, e.g. | 15 |
| Swedish cents | 13 |
| Sudbury Basin export | 20 |
| Substance in a vein | 19 |
| Substance for smelting | 22 |
| Subject of testing | 18 |
| Stuff to refine | 15 |
| Stuff to dig up | 15 |
| Stuff to be smelted | 19 |
| Stuff that may hold gold | 24 |
| Stuff of mine? | 14 |
| Stuff of mine | 13 |
| Stuff in seams | 14 |
| Stuff in a seam | 15 |
| Stuff in a bank | 15 |
| Stibnite, for one | 17 |
| Steel-furnace input | 19 |
| State that's home to Nike H.Q. | 34 |
| State s. of Washington | 22 |
| Stamp mill stuff | 16 |
| Sphalerite is one | 17 |
| South of Wash. | 14 |
| Source of scandium | 18 |
| Source of nickel | 16 |
| Source of iron, e.g. | 20 |
| Source of iron or lead | 22 |
| Soo Canal's cargo | 21 |
| Something to slag | 17 |
| Something that may be amalgamated | 33 |
| Something in that vein? | 23 |
| Something found in veins | 24 |
| Some search for it in vein | 26 |
| Some Scandinavian coins | 23 |
| Some freight cargo | 18 |
| Some can dig it | 15 |
| Some bucket conveyor material | 29 |
| Smithsonite or pentlandite, e.g. | 32 |
| Smelting input | 14 |
| Smeltery's raw material | 27 |
| Smeltery pile | 13 |
| Smeltery grist | 14 |
| Smeltery delivery | 17 |
| Smelter supply | 14 |
| Smelter stock | 13 |
| Smelter food | 12 |
| Smelter delivery | 16 |
| Small change in Denmark | 23 |
| Slag source | 11 |
| Slag base | 9 |
| Silver or iron, e.g. | 20 |
| Silver container | 16 |
| Siderite or mispickel | 21 |
| Shipment to a mill | 18 |
| Shipment from Duluth | 20 |
| Shaft lining | 12 |
| Shaft discovery | 15 |
| Setting of Pacific U. | 21 |
| Setting of Crater L. | 20 |
| Seamy material? | 15 |
| Seam-y stuff? | 13 |
| Seam valuable | 13 |
| Seam find | 9 |
| Seam discovery | 14 |
| Seam deposit | 12 |
| School of mines topic | 21 |
| Scandinavian currency | 21 |
| Salem's st. | 15 |
| Rush target | 11 |
| Rush participant's prize | 28 |
| Rush igniter | 12 |
| Runaway ___ Cart (former roller coaster in Branson, Missouri) | 61 |
| Rocky riches | 12 |
| Rock-solid asset? | 17 |
| Rock-band discovery | 19 |
| Rock with promise | 17 |
| Rock with gold or silver, say | 29 |
| Rock that some people dig | 25 |
| Rock solid? | 11 |
| Rock salt, e.g. | 15 |
| Rock often found in crosswords | 30 |
| Rock of ages | 12 |
| Rock in a shaft | 15 |