diff --git a/source/Generating/Caves.cpp b/source/Generating/Caves.cpp
index f334023ce..524bc37c7 100644
--- a/source/Generating/Caves.cpp
+++ b/source/Generating/Caves.cpp
@@ -490,7 +490,29 @@ void cCaveTunnel::ProcessChunk(
 				int SqDist = (DifX - x) * (DifX - x) + (DifY - y) * (DifY - y) + (DifZ - z) * (DifZ - z);
 				if (6 * SqDist <= SqRad)
 				{
-					cChunkDef::SetBlock(a_BlockTypes, x, y, z, E_BLOCK_AIR);
+					switch (cChunkDef::GetBlock(a_BlockTypes, x, y, z))
+					{
+						// Only carve out these specific block types
+						case E_BLOCK_DIRT:
+						case E_BLOCK_GRASS:
+						case E_BLOCK_STONE:
+						case E_BLOCK_COBBLESTONE:
+						case E_BLOCK_GRAVEL:
+						case E_BLOCK_SAND:
+						case E_BLOCK_SANDSTONE:
+						case E_BLOCK_NETHERRACK:
+						case E_BLOCK_COAL_ORE:
+						case E_BLOCK_IRON_ORE:
+						case E_BLOCK_GOLD_ORE:
+						case E_BLOCK_DIAMOND_ORE:
+						case E_BLOCK_REDSTONE_ORE:
+						case E_BLOCK_REDSTONE_ORE_GLOWING:
+						{
+							cChunkDef::SetBlock(a_BlockTypes, x, y, z, E_BLOCK_AIR);
+							break;
+						}
+						default: break;
+					}
 				}
 			}  // for y
 		}  // for x, z