Sieve
The Sieve sifts cheap, bulk blocks — gravel, sand, dirt, soul sand, and crusher "crushed" blocks — into useful resources (ore chunks, seeds, flowers, nether goodies, and more). It's one of UC's core early/mid-game resource multipliers. Sift by hand, or automate it with the Auto Sieve.
The key knob is the mesh you install: a better mesh unlocks rarer drops and boosts every drop's odds.
Crafting the Sieve
Crafted at a vanilla crafting table:
How to use
- Install a mesh — right-click the sieve holding a mesh (only the 8 UC meshes below work; anything else is rejected). Right-clicking with a different mesh swaps it; sneak + empty hand pops the mesh back out when the sieve is idle.
- Load material — right-click with an accepted block (see inputs). This consumes 1 block.
- Sift — keep right-clicking (~4 clicks) until it finishes; the drops pop out on top of the sieve.
One click sifts a whole field
Interacting with a sieve also advances every sieve in a 5×5 area around it. Lay out a grid of sieves, load them, and a single click drives them all. Compressed inputs (compressed gravel/dirt/etc.) sift into 9× the normal output.
Meshes
The mesh sets your results in two ways: it unlocks drops (a drop only appears once your mesh's tier ≥ the drop's listed tier), and its multiplier scales every drop's chance (chance × multiplier).
| Mesh | Tier | Drop multiplier | Crafted at |
|---|---|---|---|
 String |
0 | ×0.75 | crafting table |
 Flint |
1 | ×1.0 | crafting table |
 Copper |
2 | ×1.25 | crafting table |
 Iron |
3 | ×1.5 | crafting table |
 Golden |
4 | ×2.0 | crafting table |
 Emerald |
5 | ×2.5 | crafting table |
 Diamond |
6 | ×3.0 | crafting table |
 Netherite |
7 | ×4.0 | smithing table |
- Drop tiers cap at 5, so an Emerald mesh already unlocks every drop — Diamond and Netherite only add bigger multipliers.
- Because
chance × multipliercan exceed 1.0, high-tier meshes effectively guarantee common drops. - Netherite trades away one thing: it stops gravel from yielding flint, in exchange for its ×4 multiplier.
Mesh recipes
The String Mesh is the base:
Every higher tier is a ring of that tier's material around the previous mesh — e.g. the Flint Mesh:
Same ring for the rest, swapping the outer material and the previous mesh in the center: Copper (copper ingot + flint mesh), Iron (iron ingot + copper mesh), Golden (gold ingot + iron mesh), Emerald (emerald + golden mesh), Diamond (diamond + emerald mesh). The Netherite Mesh is a smithing table upgrade: netherite upgrade template + Diamond Mesh + netherite ingot.
Sieve drops
Sifting an input rolls its drop table. Listed chance is the base (before the mesh multiplier); the min mesh column is the mesh tier you need before that drop can appear at all. The _chunk items are UC intermediates that process into the real ingots/gems.
Gravel
| Drop | Base chance | Min mesh |
|---|---|---|
| Flint | 20% | String (t0, gone at Netherite) |
| Coal chunk | 25% | String (t0) |
| Iron chunk | 15% | Flint (t1) |
| Gold chunk | 5% | Iron (t3) |
| Lapis chunk | 2.5% | Iron (t3) |
| Emerald chunk | 2% | Golden (t4) |
| Diamond chunk | 1% | Golden (t4) |
Sand
| Drop | Base chance | Min mesh |
|---|---|---|
| Copper chunk | 25% | Flint (t1) |
| Bone meal | 25% | String (t0) |
| Redstone chunk | 20% | Copper (t2) |
| Gunpowder / Glowstone dust | 12% / 8% | String (t0) |
| Prismarine shard / crystals, Clay | 10% each | Copper (t2) |
| Blaze powder | 10% | Iron (t3) |
| Cactus / Kelp | 10% each | String (t0) |
| Conduit | 0.5% | Golden (t4) |
Dirt → 18 crops & saplings (carrot, potato, every seed, sugar cane, bamboo, and every sapling incl. cherry/pale oak), ~10% each, String mesh.
Grass Block → 6 flowers/plants (flowers, double plants, torchflower, pitcher plant, pink petals), ~20% each, String mesh.
Soul Sand
| Drop | Base chance | Min mesh |
|---|---|---|
| Nether quartz chunk (+ 3× bonus roll) | 33% (+10%) | Flint (t1) |
| Bone / Nether wart | 15% / 12% | String (t0) |
| Warped / Crimson fungus | 10% each | String (t0) |
| Ghast tear | 8% | Golden (t4) |
Crushed Netherrack → nether quartz chunk 33% (Flint), gold nugget 20% + nether gold chunk 33% (Iron t3), ancient debris chunk 2.5% (Emerald t5).
Crushed Endstone → needs Golden mesh (t4): chorus fruit 80%, ender pearl 16%, chorus flower 1%.
Crushed Cobbled Deepslate → deepslate coal chunk 30% (String), deepslate iron chunk 25% (Flint), deepslate lapis chunk 15% (Iron), deepslate gold/emerald/diamond chunks (Golden t4), echo shard 5% + amethyst 1% + sculk catalyst 0.5% (Emerald t5).
Auto Sieve
The powered Auto Sieve does all of the above automatically — same meshes, same drop table — consuming energy instead of clicks and depositing drops into its output. Install a mesh + speed/energy upgrades and feed it with a hopper.