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| Archive Reference / Library Class No. | NCB/A/BUT/13/11/2 |
| Former Reference | N4/125 |
| Title | Index volume named "Rheolaveur", possibly for correspondence or accounts of Euston Mitton relating to the coal washing plant |
| Date | [1920s] |
| Description | Eustace Mitton was the mining engineer and a director of the Butterley Company, who was said to have been the person who introduced the Rheolaveur coal washing process into the United Kingdom, a process developed in Belgium in the early 1910s. |
| Extent | 1 volume |
| Level | Item |
| Repository | Derbyshire Record Office |
| Archive Creator | Butterley Company |
| National Coal Board |