Can anyone help me troubleshoot why slimes aren't spawning in my slime farm?

Here is my seed @ Chunkbase: 7246271457164700537

I just started this farm today, and have a couple hours into clearing rock. However, I am starting to have second thoughts as I've yet to see a slime in this chunk. Although, at some point my trap did kill one. Found a slimeball in my chest.

Since I have been mining in this area for hours, I would have expected more than -one- slime.... No other mobs have ever spawned here since I have been clearing rock. The place is very well lit.

I am running v1.8.9.

Thanks /dj

In-game screen with coords Coords confirmed with Amidst AND Chunkbase

  • Slimes need a lot of light, and if you want to see slime spawning, you have to to the farm at level -7 (i think). Also, slime don't spawn if you're near that chunk. If you're ≈20 blocks ftom that chunk, they'll spawn.
    – spund3
    Feb 6, 2016 at 10:15
  • 1
    @spund3 Slimes in slime chunks at y<40 ignore light levels completely. Slime farms are light up to light level 8+ to prevent other types of mobs from spawning.
    – MrLemon
    Feb 6, 2016 at 19:14

1 Answer 1


This is probably a combination of 2 things:

1. You are simply too close

From the wiki page on spawning:

Spawn conditions

Each individual spawn attempt succeeds only if all of the following conditions are met:

  • There must be no players and no player spawn points within a 24 block distance (spherical) of the spawning block
  • [...]

While mining out a chunk, you are typically not more than 24 blocks away from any spawnable surfaces, meaning that no slime was allowed to spawn.

2. The mob cap was filled by other mobs

There is a fixed limit for the number of hostile mobs that can exist in the game at any one time (70 for single player). It is possible that these 70 mobs spawned in caves surrounding your slime chunks. Unless you leave the area, mobs don't respawn all at once, and it's possible to cap the mobs almost all the time, making it hard for a poor Slime to fill one of the free slots.

The wiki has a helpful image regarding spawning and despawning rules:

spawning radii

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