Eventually a tunnel was built from the slate quarry through to the harbour level which improved efficiency tremendously. They also had a brilliant and commendable idea that would mean they could put the waste slate to good use, they crushed it and used it as a constituent for producing bricks. They could produce 50,000 bricks per week.
As they were also producing granite by this time there was a great deal of sea traffic with ships loading up with bricks, slate and crushed and graded stone for road building. This was the time of the Industrial Revolution and there was a ready market for what the area produced.