23:52 Mar 21, 2011 

... since 'sierra de cadena' is most certainly not the usual term used by Chilean forestry workers, I suggest you also indicate the country for which you are translating.

23:45 Mar 21, 2011 

for not posting these as two separate qs?
And while we're at it, how about a little dollop of context. This looks v straightforward, but you've posted as Proz so it may not be so.
Leña (vendedores de / comerciantes en) y sierra de cadena serían mis opciones de inmediato