| Locality | Latitude | Longitude | Distance | Bearing |
|---|
| Columbia coal mines, Mahaska County, Iowa, USA | 41° 20' 38" N | 92° 25' 17" W | 8.5km (5.3 miles) | |
| Keswick, Keokuk County, Iowa, USA | 41° 27' 9" N | 92° 14' 21" W | 11.2km (6.9 miles) | |
| Keswick quarry, Keswick, Keokuk County, Iowa, USA | 41° 27' 59" N | 92° 15' 9" W | 11.2km (6.9 miles) | |
| Spring Creek coal mines, Mahaska County, Iowa, USA | 41° 18' 2" N | 92° 33' 16" W | 20.1km (12.5 miles) | |
| Buck Creek Mine coal mines, Mahaska County, Iowa, USA | 41° 29' 16" N | 92° 35' 41" W | 22.2km (13.8 miles) | |
| Harper quarry, Harper, Keokuk County, Iowa, USA | 41° 23' 46" N | 92° 5' 12" W | 22.4km (13.9 miles) | |
| Evans coal mines, Mahaska County, Iowa, USA | 41° 30' 6" N | 92° 36' 51" W | 24.3km (15.1 miles) | |
| Harper, Keokuk County, Iowa, USA | 41° 21' 45" N | 92° 3' 3" W | 25.7km (16.0 miles) | |
| Oskaloosa, Mahaska County, Iowa, USA | 41° 17' 47" N | 92° 38' 38" W | 26.8km (16.7 miles) | |
| Drill Hole (MRDS 10082006), Mahaska County, Iowa, USA | 41° 14' 45" N | 92° 36' 39" W | 27.5km (17.1 miles) | |
| Kaser Quarry, Ollie, Keokuk County, Iowa, USA | 41° 12' 14" N | 92° 8' 19" W | 28.4km (17.7 miles) | |
| Limestone quarry, Poweshiek County, Iowa, USA | 41° 31' 10" N | 92° 39' 58" W | 29.1km (18.1 miles) | |
| Drill Hole (MRDS 10082042), Mahaska County, Iowa, USA | 41° 10' 30" N | 92° 34' 44" W | 31.4km (19.5 miles) | |
| Lost Creek coal mines, Mahaska County, Iowa, USA | 41° 10' 58" N | 92° 35' 35" W | 31.4km (19.5 miles) | |
| Ollie, Keokuk County, Iowa, USA | 41° 11' 52" N | 92° 5' 32" W | 31.5km (19.6 miles) | |
| Occurrence (MRDS 10082043), Mahaska County, Iowa, USA | 41° 17' 7" N | 92° 44' 58" W | 35.4km (22.0 miles) | |
| Eddyville area coal strip mines, Wapello County, Iowa, USA | 41° 9' 31" N | 92° 38' 4" W | 35.7km (22.2 miles) | |
| Malcom, Poweshiek County, Iowa, USA | 41° 42' 29" N | 92° 33' 32" W | 38.1km (23.7 miles) | |
| Occurrence (MRDS 10100293), Mahaska County, Iowa, USA | 41° 11' 46" N | 92° 45' 35" W | 40.8km (25.4 miles) | |
| Occurrence (MRDS 10082041), Mahaska County, Iowa, USA | 41° 13' 38" N | 92° 47' 9" W | 40.9km (25.4 miles) | |
| Star Coal Company strip mine, Mahaska County, Iowa, USA | 41° 12' 42" N | 92° 47' 5" W | 41.7km (25.9 miles) | |
| Occurrence (MRDS 10082005), Mahaska County, Iowa, USA | 41° 13' 35" N | 92° 47' 58" W | 42.0km (26.1 miles) | |
| Drill Hole (MRDS 10082009), Wapello County, Iowa, USA | 41° 2' 24" N | 92° 31' 4" W | 42.4km (26.4 miles) | |
| Mich mine, Oskaloosa, Mahaska County, Iowa, USA | 41° 11' 50" N | 92° 48' 12" W | 43.8km (27.2 miles) | |
| Malcom Quarry, Malcom, Poweshiek County, Iowa, USA | 41° 45' 39" N | 92° 35' 52" W | 44.8km (27.9 miles) | |
| Drill Hole (MRDS 10082010), Wapello County, Iowa, USA | 41° 2' 38" N | 92° 36' 43" W | 45.2km (28.1 miles) | |
| West Chester limestone quarry, Washington County, Iowa, USA | 41° 22' 41" N | 91° 48' 47" W | 45.2km (28.1 miles) | |
| Drill Hole (MRDS 10100294), Mahaska County, Iowa, USA | 41° 14' 42" N | 92° 51' 32" W | 45.6km (28.3 miles) | |
| Calcite locality, Pella, Marion County, Iowa, USA | 41° 22' 0" N | 92° 54' 50" W | 46.8km (29.1 miles) | |
| Pella, Marion County, Iowa, USA | 41° 24' 29" N | 92° 54' 59" W | 46.9km (29.1 miles) | |
