# What is the most efficient way to use TNT?

After months of curiosity I have finally caved (no pun intended) to trying out minecraft. I am currently trying to clear out a very large 25x25 area. I have built my first block of TNT and I'm ready to get down to buisness. I have read that enclosed in stone the explosion will create a 3x3x3 hole. However, what about not enclosed in stone? What is the proper hole size deep, and wide in order to maximize the blocks destroyed in a TNT blast? Assuming that all the sourrounding material is all basic stone.

Also possibly important to note: I don't care about any ore's destroyed in the process. I just want to make a very large dent in my project by blowing things up. Plus TNT is the manlier way to do it.

– l I
Commented Apr 17, 2012 at 12:40
• The best way to use TNT is to use loads of it. Commented Apr 17, 2012 at 14:32
• @fredley Unfourtunatley I don't have a lot of gunpowder at the moment :< Commented Apr 17, 2012 at 14:36

Let's do some experiments!

I'm going to assume we're interested in making square holes, for several reasons:

• It's easier to measure and compare that way.
• You probably want flat walls.
• If you find a good blast pattern, you can do the same thing side-by-side to clear a larger area in multiples of the pattern without wasting any blast power.

I am also going to ignore the possibility of encountering a vein of dirt or gravel, which is much easier to blast and results in much less predictability of the results due to irregular obscured shape.

That 3×3×3 cube fact is true, but only if the TNT is actually fully encased — which would be a waste of time since you would have to light the TNT and then plug the hole. The way I have used TNT to dig is to make a 3-deep hole and place TNT at the bottom of it (or drop lit TNT down from the top, which requires less careful cursor work). In addition to blowing out the cube, it will also take out nearly all of the fourth layer above (say, with one block remaining). I have found this to be a very convenient strategy.

In this case, each TNT will blow up 3×3×4 - 3 - 1 = 32 blocks, and 4 (11%) were removed by hand.

Suppose we place a single TNT on a flat stone surface and ignite it. I did this and got a 7×1×7 hole where the outside was only partly exploded, leaving 12-15 blocks [3 trials].

7 × 7 - 14 = 35 blocks, and you'll want to clear the remaining 14 (28%) by hand since they're irregularly shaped so a blast would be wasteful.

How about the same as above but with the TNT inset into the ground by 1 block? That turns out to be the same as the first case without the blocks above, so it removes only 9+8 = 17 blocks.

Let's go higher. Placing a TNT on top of some leaves (blast resistance = 1) results in another 7×7 pattern, but with only 9 blocks left unexploded.

Another block higher and there are many more blocks remaining; I'll stop here for now and assume this direction isn't useful.

So, the on-the-surface configuration blasts more area, but surely it wastes all that blast going sideways and upward. Let's try setting off a TNT in the center of a 3×3×4 hole produced by the first method (supporting the TNT with a block of leaves).

Whee! The second blast nearly perfectly enlarged the cube, leaving only 4 corner pieces. That means we destroyed 5×5×5 - 4 = 121 blocks, or 60.5 per TNT, with 3 + 4 = 7 blocks (6%) to clear by hand.

A third TNT, supported 2 spaces above with 1 block of leaves, after clearing the irregularities, resulted in an irregular 7×7×6 hole with 52 blocks left in it, meaning 7×7×6 - 52 - 7 = 235 blocks = 78.3̅ per TNT were destroyed. This is an excellent efficiency, but notice that the amount of hand-work has gone up to 59 blocks (20%).

A fourth centered blast, after clearing the irregularities, only scarred the walls a bit; I'm not going to bother working out the numbers.

In conclusion, based on the patterns I've tried, the most efficient pattern (in terms of blocks exploded per block of TNT) is three blasts at the same center point, starting with a 3-deep hole in the ground, manually smoothing off the walls between each step.

(However, these tests were conducted in creative mode, so I did not concern myself with safety (i.e. getting out of the hole). The temporary stairs required to exit after the second and third setups may affect the patterns; or you could use a water stream or drop lit TNT from a frame above.)

On the other hand, if you want to minimize manual effort while making a square hole, then I recommend using two blasts, as that has the lowest manual work percentage while still being quite efficient in TNT.

My experimental setup was a flat stone surface with a surrounding 11×11 obsidian ring to aid counting and provide a height reference in case I blew up all the surface. Shown here is the situation immediately after the fourth blast discussed above.

Also, thanks for asking this question! I have learned an improvement to my own blasting technique.

• Now THIS is the kind of answer I was looking for. Very nice application of science! Commented Apr 17, 2012 at 18:08
• Thanks. Considered as practice of science, I'd note that it's a bit short on sample size (since TNT blasts are somewhat random but I ran most of the tests only once). I'm sure you'll take care of the [replication](en.wikipedia.org/wiki/Replication_(scientific_method)) part, though! Commented Apr 17, 2012 at 18:14
• Yeah, when I get out of work much damage will be done. I suspect I will die at least a few times in the process lol. Commented Apr 17, 2012 at 19:18
• Stash your stuff in a chest, descend into the hole with just one TNT, eh? (Actually, a single blast won't harm your inventory when you die, even.) Commented Apr 17, 2012 at 20:06
• No matter how cautious I am in this game I always manage to plunge thousands of feet to my doom, or get blown to bits by a creeper. Commented Apr 17, 2012 at 20:10

Check this: https://minecraft.wiki/w/TNT