| Clue | Source | Date |
|---|---|---|
| Metal-bearing rocks | Newsday | 01 Mar 2021 |
| Rocks from mines | Newsday | 08 Feb 2021 |
| Minecraft resources | USA Today | 07 Feb 2021 |
| Unrefined finds in mines | Universal | 04 Feb 2021 |
| Miners' materials | Universal | 29 Jan 2021 |
| Underground rock group | Newsday | 21 Jan 2021 |
| Mining products | USA Today | 19 Jan 2021 |
| Metals-in-the-rough | Family Time | 17 Jan 2021 |
| Refinery input | Thomas Joseph | 30 Dec 2020 |
| Mine extracts | Newsday | 28 Dec 2020 |
| Tram loads | Premier Sunday | 27 Dec 2020 |
| Mine finds | Universal | 23 Dec 2020 |
| Finds in mines | LA Times Daily | 15 Dec 2020 |
| Metals in rocks | Newsday | 14 Dec 2020 |
| Metal deposits | New York Times | 14 Dec 2020 |
| Unrefined metals | Universal | 11 Dec 2020 |
| Metal sources | Thomas Joseph | 10 Dec 2020 |
| Mined finds | USA Today | 28 Nov 2020 |
| Smelter's inputs | New York Times | 22 Nov 2020 |
| Copper sources | The Washington Post Sunday | 08 Nov 2020 |
| Minecraft finds | Universal | 04 Nov 2020 |
| Mine outputs | Universal | 03 Nov 2020 |
| Rocks dug up from mines | Newsday | 02 Nov 2020 |
| Miners' finds | USA Today | 31 Oct 2020 |
| Sources of 1-Down and 84-Down | Premier Sunday | 25 Oct 2020 |
| Resources that may contain copper | Universal | 21 Oct 2020 |
| Gold and silver have them, but not bronze | New York Times | 14 Oct 2020 |
| Mine yields | USA Today | 06 Oct 2020 |
| Mining finds | The Washington Post | 05 Oct 2020 |
| Many end in '-ite' | New York Times | 04 Oct 2020 |
| Mineral sources | Thomas Joseph | 18 Sep 2020 |
| Lodes' contents | Universal | 07 Sep 2020 |
| Minerals | The Telegraph Quick | 02 Sep 2020 |
| Mine extractions | USA Today | 02 Sep 2020 |
| Mine deposits | Universal | 01 Sep 2020 |
| Minecraft blocks | Wall Street Journal | 27 Aug 2020 |
| Mining company's finds | The Washington Post Sunday | 09 Aug 2020 |
| Raw materials | Eugene Sheffer | 07 Aug 2020 |
| Rocks from a mine | Newsday | 03 Aug 2020 |
| Mining hauls | The Washington Post | 29 Jul 2020 |
| Raw metals | Universal | 27 Jul 2020 |
| Metal-laden rocks | Newsday | 27 Jul 2020 |
| Valuable extractions | Wall Street Journal | 23 Jul 2020 |
| Valuable rocks | LA Times Daily | 21 Jul 2020 |
| Mining targets | USA Today | 25 Jun 2020 |
| Rocks taken from mines | Newsday | 23 Jun 2020 |
| Mineral deposits | Family Time | 15 Jun 2020 |
| Metals can be extracted from them | USA Today | 31 May 2020 |
| Mine materials | USA Today | 29 May 2020 |
| Galena and sphalerite | New York Times | 05 May 2020 |
| Refinery rocks | Thomas Joseph | 22 Apr 2020 |
| Mineralogists study them | Universal | 12 Apr 2020 |
| Some rock bands | Newsday | 03 Apr 2020 |
| Assayers' samples | Newsday | 08 Mar 2020 |
| Minecart fillers | USA Today | 06 Mar 2020 |
| Vein yields | Universal | 29 Feb 2020 |
| Materials for metallurgists | Wall Street Journal | 22 Feb 2020 |
| Mineral bearers | Canadiana | 27 Jan 2020 |
| They're in need of refinement | The New Yorker | 13 Jan 2020 |