| Kawamata | Japan | 1 |
| Kaznakhtinskiy ultrabasic massif | Russia | 1 |
| Kendyktas Mountains | Kazakhstan | 1 |
| Kerimasi volcano | Tanzania | 1 |
| Kesebol Mn-(Fe-Cu) deposit | Sweden | 1 |
| Keystone | United States | 1 |
| Kievey Fedorovo-Pana layered intrusion | Russia | 1 |
| Kilju County | North Korea | 1 |
| Kiryū | Japan | 1 |
| Kishon Mid Reach zone 2 | Israel | 1 |
| Kitagoha river | Democratic Republic of the Congo | 1 |
| Klöch | Austria | 1 |
| Koffiefontein mine | South Africa | 1 |
| Kolwezi | Democratic Republic of the Congo | 1 |
| Komono | Japan | 1 |
| Komsomolsky District, Khabarovsk Krai | Russia | 1 |
| Koralpe | Austria | 1 |
| Kramer district | United States | 1 |
| Kremnica deposit | Slovakia | 1 |
| Kristineberg Zn-Cu mine | Sweden | 1 |
| Kryvbas | Ukraine | 1 |
| Kråkmo | Norway | 1 |
| Kuandian Manchu Autonomous County | People's Republic of China | 1 |
| Kunashir Island | Japan | 1 |
| Kuniok river valley | Russia | 1 |
| Kyshtym | Russia | 1 |
| Kōchi Prefecture | Japan | 1 |
| La Clarté, Perros-Guirec | France | 1 |
| La Esperanza mine, Durango | Mexico | 1 |
| La Sal Mountains | United States | 1 |
| Lackner | Canada | 1 |
| Lagoscuro mine | Italy | 1 |
| Laguna Santa Maria | Argentina | 1 |
| Lake Nemi | Italy | 1 |
| Lake Rason | Australia | 1 |
| Lake Taupō | New Zealand | 1 |
| Lane County | United States | 1 |
| Langis Mine | Canada | 1 |
| Lavrio | Greece | 1 |
| Le Bourg-d'Oisans | France | 1 |
| Le Rancié Mine | France | 1 |
| Leopoldshall | Germany | 1 |
| Les Hureaux | France | 1 |
| Leskhozovskiy granitic pegmatite | Tajikistan | 1 |
| Letseng diamond mine | Lesotho | 1 |
| Lillian Mines | United States | 1 |
| Linares | Spain | 1 |
| Little Three mine | United States | 1 |
| Little Årøya | Norway | 1 |
| Llandybie | United Kingdom | 1 |
| Lolon mine | Chile | 1 |
| Lovelock | United States | 1 |
| Luanhe valley | People's Republic of China | 1 |
| Lucin | United States | 1 |
| Lucky Strike Mine | United States | 1 |
| Luserna stone quarries | Italy | 1 |
| Långban Mine | Sweden | 1 |
| Lüneburg | Germany | 1 |
| Madoc area | Canada | 1 |
| Madrelena mine, Tres Pozos | Mexico | 1 |
| Magnesia Prefecture | Greece | 1 |
| Maletoyvayam ore field | Russia | 1 |
| Mallestiger Mittagskogel | Austria | 1 |
| Malysheva | Russia | 1 |
| Mariposa County | United States | 1 |
| Masaka gold mine | Burundi | 1 |
| Matilda mine | Peru | 1 |
| Maying | People's Republic of China | 1 |
| Mazapil Municipality | Mexico | 1 |
| Mejillones Peninsula | Chile | 1 |
| Mendes Pimentel | Brazil | 1 |
| Merensky Reef | South Africa | 1 |
| Mexico | Mexico | 1 |
| Mezö-Madaras meteorite | Romania | 1 |
| Miedzianka, Lower Silesian Voivodeship | Poland | 1 |
| Milan | United States | 1 |
| Millbury | United States | 1 |
| Minas Gerais | Brazil | 1 |
| Mineral Liga de Los Algodones | Chile | 1 |
| Mines of Canchas | Chile | 1 |