Campaigners claim an ancient landscape could be damaged if land near the Wrekin in Shropshire is mined.
Campaigners say the land near the Wrekin is historically important
The Friends of the Ercall group said a cave thought to have been lived in by a hermit monk, a holy well and burial mounds should be protected.
UK Coal has submitted plans to extract 900,000 tonnes of coal from ten shallow lying seams near Huntington Lane.
The company claims 90 jobs would be created and that brick making fireclay would also be recovered.
Lawrence Price, from the Friends group, said: "My concern for the cave is the roof is a shaley material.
"If, in the neighbouring area, they do deep blasting for this mining, the vibration may well travel through the ground and cause the cave to collapse."
He said there were a number of ancient burial mounds in woods nearby and several standing stones.
A hermit monk is believed to have lived in the cave near the Wrekin, with some believing it could have been Saint Gilbert, Mr Price added.