North Bay Resources Inc (NBRI)

[Beau1954]

Channels and tunnels, the tunnels are always cut out of solid rock below the channels, if you can imagine trying to cut a channel in the sand and how hard it is to keep from getting caveins from the soft gravels in the channels. the track haulage is installed on bedrock and except for the occasional cave ins the tunnel is stable. Once you start doing a tunnel you will know about where channels are running above by water that will be dripping down from the ceiling. They will cut an alcove out in the tunnel and bring in a drill and drill up until they reach gravel, the slurry coming down is tested until they reach gravel instead of rock coming down. Once they hit gravel they know exactly how far up the channel is. they will move over to both sides of the first drilling and do it again and measure the depth. They do that until they feel they are in the middle of the channel and sample the gravel they are getting. If it looks good they will build a tunnel there with track haulage and then build a raise up to the gravel and start working the channel. The Ruby already has mapping of all the known channels so most of that work is already done. Right now they will start working the know channels like the White and the Black. You can see from the pictures of the White channel how big the raise is. IMSHA wants the raise bigger in the event of a rescue they need it bigger. With the blasting permit they can now make the raise bigger and rebuild the chute coming down. Once that is done they can bring in the equipment to pull the gravel down and start processing it.