From: djb@invalid.com   
      
   On 26/08/2025 17:10, Richard Smith wrote:   
   > David Billington  writes:   
   >   
   >> On 26/08/2025 12:13, Richard Smith wrote:   
   >>> ...   
   >> I saw this recently https://youtu.be/hXYrfnFP-jc?t=558 , realising it   
   >> was in Cornwall you might have been there, if not some local interest   
   >> processing tin ore.   
   > Haven't seen this exact one - it is a   
   A bit earlier, in case you didn't watch the whole video, is another   
   crusher but for larger material https://youtu.be/hXYrfnFP-jc?t=445 .   
   > Cornish stamps.   
   >   
   > The   
   > California Stamps   
   > are superior, but need rolled steel bar - which arrived with the   
   > Bessemer and open-hearth steelmaking processes.   
   >   
   > The Cornish stamps were readily made in the days of cast iron (only) -   
   > and wood.   
   >   
   > To give some idea of importance - the village of Twelveheads is just   
   > down the valley - which is proudly named in honour of the stream would   
   > power a set of 12 stamps heads.   
   >   
   > They work well - both Cornish and California stamps.   
   >   
   > King Edward Mine museum can still produce kilos of tin with its   
   > California stamps readily.   
   >   
   > My rod-mill does the same exactly the same task - for a much smaller   
   > size etc.   
   > But needs variable-speed drive and things which have only become readily   
   > available economically in recent times.   
      
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