Produced green and red slates. Pit working used for landfill. There is also much reworking of slate waste as aggregate.
The entire area between here and Gwernor is rather confused by modern usage.
                     
                
                
                            
                    Publications (1)
                
                
                    
                                                        - Richards, Alun John (1991); Gazeteer of the Welsh Slate Industry, A; Gwasg Carreg Gwalch 978-0863811968
 
                                            
                
                
                            
                
                
                        
            
                
                
                
            
                            
                
                
                    
                    
                    
                        
                                                            
Ty Mawr West - 141m 
                                                            
Ty Mawr Green - 199m 
                                                            
Plas Du - 299m 
                                                            
Nantlle Vale - 315m 
                                                            
Tanrallt - 327m 
                                                            
Singrig - 411m 
                                                            
Twll John Fowc - 446m 
                                                            
Twll Coed - 457m 
                                                            
Gwernor - 631m 
                                                            
Twll Llwyd - 639m 
                                                            
Coed Madog - 701m 
                                                            
Fronlog - 780m 
                                                            
Cornwall - 787m 
                                                            
Taldrwst - 804m 
                                                            
Gwernor - 817m 
                                                            
Cloddfa'r Coed - 844m 
                                                            
Nant y Fron - 941m 
                                                            
Pwll Fanog - 999m 
                                                            
Tal y Sarn - 1,058m 
                                                            
Dorothea - 1,080m 
                                                            
Tyddyn Agnes - 1,272m 
                                                            
Gallt y Fedw - 1,299m 
                                                            
Blaen y Cae - 1,344m 
                                                            
Allt Llechi - 1,355m 
                                                            
Ty'n y Llwyn - 1,396m 
                                                            
Twll Balast - 1,443m 
                                                            
Cloddfa Lon Twll Mawr - 1,622m 
                                                            
Cilgwyn - 1,672m 
                                                            
Bryn Castell - 1,695m 
                                                            
Wern Ifan - 1,786m 
                                                            
Pen y Bryn - 1,873m