In 1877 a company called Kit Hill Tunnel Ltd began work on both the south and north sides of the hill to create a tunnel which would be long. The southern portal was at Silver Hill, and that at the north was near a small mine called Excelsior. However, due to the toughness of the underlying bedrock, progress was costly and slow, and ceased about a year later. In 1881 a new company named Kit Hill Great Consols took over the setts of Kit Hill United and Excelsior mine. They deepened the North Engine Shaft to 112 fathoms and lengthened the tunnel running south to meet it. However, this too was proving too costly, and wound up in 1885, before it was half-way complete. Several later attempts were made to extend the Excelsior Tunnel, but by 1938, it was still only long.