Bryncoch is situated along the Pantymwyn North Vein, which extends eastward from the River Alyn through Carboniferous Limestone, Cefn-y-fedw Sandstone, and into the Coal Measures.

The landscape is marked by several grassed-over shafts and mounds, with extensive lead dressing waste scattered throughout the area. Among the surviving features, a large shaft at SJ 2010 6480, now fenced off, contains the collapsed remains of a stone-built engine house falling into it and is likely Taylor’s Shaft. Another capped and fenced-off shaft remains at SJ 2020 6475, while the shaft and possible whim site at SJ 1998 6485 may correspond to the old Boundary Shaft. The mines were historically drained by the Bellan Adit Level, which was driven from the River Alyn at SJ 2120 6540 to the West Flat Rod Shaft.

Between 1901 and 1913, the Mold Mines were reworked, leading to the sinking of New Shaft at SJ 2080 6520, north of Gwernaffield. After mining operations ceased, this shaft was later connected to the Sea Level Tunnel. Today, the site of New Shaft lies within woodland that has been largely cleared of mining evidence, with only the concrete foundations of former structures remaining at SJ 2080 6520.