1 files changed, 28 insertions, 19 deletions
diff --git a/src/main/java/gregtech/common/tileentities/machines/basic/GT_MetaTileEntity_Miner.java b/src/main/java/gregtech/common/tileentities/machines/basic/GT_MetaTileEntity_Miner.java
index 787c3c0d76..35cc78d162 100644
--- a/src/main/java/gregtech/common/tileentities/machines/basic/GT_MetaTileEntity_Miner.java
+++ b/src/main/java/gregtech/common/tileentities/machines/basic/GT_MetaTileEntity_Miner.java
@@ -175,10 +175,19 @@ public class GT_MetaTileEntity_Miner extends GT_MetaTileEntity_BasicMachine {
                 if (drillY == 0 || oreBlockPositions.isEmpty()) {
                     moveOneDown(aBaseMetaTileEntity);
                 } else {
-                    ChunkPosition oreBlockPos = oreBlockPositions.remove(0);
-                    mineBlock(aBaseMetaTileEntity, oreBlockPos.chunkPosX, oreBlockPos.chunkPosY, oreBlockPos.chunkPosZ);
-                    if (debugBlockMiner) {
-                        GT_Log.out.println("MINER: Mining GT ore block at " + oreBlockPos.chunkPosX + " " + drillY + " " + oreBlockPos.chunkPosZ);
+                    ChunkPosition oreBlockPos;
+                    Block block;
+                    do {
+                        oreBlockPos = oreBlockPositions.remove(0);
+                        block = aBaseMetaTileEntity.getBlockOffset(oreBlockPos.chunkPosX, oreBlockPos.chunkPosY, oreBlockPos.chunkPosZ);
+                    } // someone else might have removed the block
+                    while (block == Blocks.air && !oreBlockPositions.isEmpty());
+
+                    if (block != Blocks.air) {
+                        mineBlock(aBaseMetaTileEntity, block,
+                            aBaseMetaTileEntity.getXCoord() + oreBlockPos.chunkPosX,
+                            aBaseMetaTileEntity.getYCoord() + oreBlockPos.chunkPosY,
+                            aBaseMetaTileEntity.getZCoord() + oreBlockPos.chunkPosZ);
                     }
                 }
             }
@@ -236,11 +245,9 @@ public class GT_MetaTileEntity_Miner extends GT_MetaTileEntity_BasicMachine {
             waitMiningPipe = true;
             return false;
         }
-        if (aBaseMetaTileEntity.getBlockOffset(0, drillY - 1, 0) != Blocks.air) {
-            mineBlock(aBaseMetaTileEntity, 0, drillY - 1, 0);
-            if (debugBlockMiner) {
-                GT_Log.out.println("MINER: Removed block to replace with pipe" );
-            }
+        Block block = aBaseMetaTileEntity.getBlockOffset(0, drillY - 1, 0);
+        if (block != Blocks.air) {
+            mineBlock(aBaseMetaTileEntity, block, xCoord, yCoord + drillY - 1, zCoord);
         }
         aBaseMetaTileEntity.getWorld().setBlock(xCoord, yCoord + drillY - 1, zCoord, MINING_PIPE_TIP_BLOCK);
         drillY--;
@@ -248,18 +255,20 @@ public class GT_MetaTileEntity_Miner extends GT_MetaTileEntity_BasicMachine {
         return true;
     }
 
-    public void mineBlock(IGregTechTileEntity aBaseMetaTileEntity, int x, int y, int z) {
-        if (!GT_Utility.eraseBlockByFakePlayer(getFakePlayer(aBaseMetaTileEntity), aBaseMetaTileEntity.getXCoord() + x, aBaseMetaTileEntity.getYCoord() + y, aBaseMetaTileEntity.getZCoord() + z, true)) {
+    public void mineBlock(IGregTechTileEntity aBaseMetaTileEntity, Block block, int x, int y, int z) {
+        if (!GT_Utility.eraseBlockByFakePlayer(getFakePlayer(aBaseMetaTileEntity), x, y, z, true)) {
             if (debugBlockMiner)
-                GT_Log.out.println("MINER: FakePlayer cannot mine block at " + (aBaseMetaTileEntity.getXCoord() + x) + ", " + (aBaseMetaTileEntity.getYCoord() + y) + ", " + (aBaseMetaTileEntity.getZCoord() + z));
-            return;
+                GT_Log.out.println("MINER: FakePlayer cannot mine block at " + x + ", " + y + ", " + z);
+        } else {
+            ArrayList<ItemStack> drops = getBlockDrops(block, x, y, z);
+            if (drops.size() > 0)
+                mOutputItems[0] = drops.get(0);
+            if (drops.size() > 1)
+                mOutputItems[1] = drops.get(1);
+            aBaseMetaTileEntity.getWorld().setBlockToAir(x, y, z);
+            if (debugBlockMiner)
+                GT_Log.out.println("MINER: Mining GT ore block at " + x + " " + y + " " + z);
         }
-        ArrayList<ItemStack> drops = getBlockDrops(aBaseMetaTileEntity.getBlockOffset(x, y, z), aBaseMetaTileEntity.getXCoord() + x, aBaseMetaTileEntity.getYCoord() + y, aBaseMetaTileEntity.getZCoord() + z);
-        if (drops.size() > 0)
-            mOutputItems[0] = drops.get(0);
-        if (drops.size() > 1)
-            mOutputItems[1] = drops.get(1);
-        aBaseMetaTileEntity.getWorld().setBlockToAir(aBaseMetaTileEntity.getXCoord() + x, aBaseMetaTileEntity.getYCoord() + y, aBaseMetaTileEntity.getZCoord() + z);
     }
 
     private ArrayList<ItemStack> getBlockDrops(final Block oreBlock, int posX, int posY, int posZ) {