1875-1876  Postlethwaite Bros.  1877-1890  John Postlethwaite  1891-1897  Postlethwaite Eskett Mining Co.  1898-1904  Postlethwaite Eskett Mining Co. Ltd
                     
                
                
                            
                    Publications (2)
                
                
                    
                                                                - (1924); BGS - Mineral Resources of GB (c1920s) Vol VIII 2nd Ed - Iron Ore - Hematites of West Cumberland, Lancashire and Lake District; 245 pages
- Hewer, R.E.; NMRS (1988); British Mining 36 - Kelton & Knockmurton Iron Mines, The; ISBN 0901450 34 0; pp.8.
                            
                
                
                        
            
                
                
                
            
                            
                
                
                    
                    
                    
                        
                                                             Salter Hall, Ann Pit - 284m Salter Hall, Ann Pit - 284m
 Salter Hall, Pit No.1 - 396m Salter Hall, Pit No.1 - 396m
 Salter & Eskett Park Mine - 431m Salter & Eskett Park Mine - 431m
 Florence Pit - 623m Florence Pit - 623m
 Salter Mine - 642m Salter Mine - 642m
 Salter Hall Quarry - 642m Salter Hall Quarry - 642m
 Parkside Winder, Pit No.20 - 670m Parkside Winder, Pit No.20 - 670m
 Eskett, Pit No.9 - 803m Eskett, Pit No.9 - 803m
 Winder No.3 Pit - 862m Winder No.3 Pit - 862m
 Eskett Park, Pit No.3 - 871m Eskett Park, Pit No.3 - 871m
 Eskett Park, Pit No.2 - 873m Eskett Park, Pit No.2 - 873m
 Winder Gill Mine - 927m Winder Gill Mine - 927m
 Margaret Pit - 931m Margaret Pit - 931m
 Agnes Pit - 941m Agnes Pit - 941m
 Rowrah Hall Quarry - 942m Rowrah Hall Quarry - 942m
 Eskett Park, Pit No.4 - 944m Eskett Park, Pit No.4 - 944m
 Eskett Park, Pit No.1Pit - 974m Eskett Park, Pit No.1Pit - 974m
 Gin Pit - 976m Gin Pit - 976m
 Stockow Hall Mine - 977m Stockow Hall Mine - 977m
 Eskett Park, Pit No.5 - 998m Eskett Park, Pit No.5 - 998m
 Winder No.1 Pit - 1,030m Winder No.1 Pit - 1,030m
 Agnes (Old) Pit - 1,080m Agnes (Old) Pit - 1,080m
 Francis Pit - 1,152m Francis Pit - 1,152m
 Stockhowhall Quarry - 1,217m Stockhowhall Quarry - 1,217m
 Arlecdon Mine - 1,264m Arlecdon Mine - 1,264m
 Yeathouse No.1 Pit - 1,399m Yeathouse No.1 Pit - 1,399m
 Yeathouse No.2 Pit - 1,448m Yeathouse No.2 Pit - 1,448m
 Moorfield Pit - 1,466m Moorfield Pit - 1,466m
 Lonsdale, Pit No.1 - 1,490m Lonsdale, Pit No.1 - 1,490m
 Lonsdale, Pit No.6 - 1,528m Lonsdale, Pit No.6 - 1,528m
 Lonsdale, Pit No.2 - 1,537m Lonsdale, Pit No.2 - 1,537m
 Lonsdale, Pit No.3 - 1,563m Lonsdale, Pit No.3 - 1,563m
 Lonsdale, Pit No.5 - 1,573m Lonsdale, Pit No.5 - 1,573m
 Lonsdale, Pit No.4 - 1,595m Lonsdale, Pit No.4 - 1,595m
 Kelton Quarries - 1,697m Kelton Quarries - 1,697m
 Dyke Nook Mine - 1,898m Dyke Nook Mine - 1,898m
 Mowbray - 1,900m Mowbray - 1,900m
 Mowbray Mine, Pit No.3 - 1,991m Mowbray Mine, Pit No.3 - 1,991m