Dirty Gravel

Dirty Gravel is obtained by processing certain ores in a Grinder, and can be either smelted in a Slag Furnace directly, or washed in a Mixer to create Clean Chunks, prior to further processing.

Dirty Gravel can be made from Copper, Tin, Iron, Gold, and Silver Ore. ''Note that Silver Ore produces Dirty Galena Gravel, this will produce bonus Lead Ingots at a roughly equal amount to the final yield of Silver Ingots, as long as the Dirty Gravel is processed in a Mixer, Slag Furnace, and Crystallizer. If it is smelted directly in a Slag Furnace, no bonus Lead Ingots will be produced.''

Ingot Yield 1 - Smelt the Dirty Gravel directly in a Slag Furnace.

Ingot Yield 2 - Wash the Dirty Gravel in a Mixer to produce Clean Chunks, then smelt the Clean Chunks in a Slag Furnace to produce Reduced Chunks, then process the Reduced Chunks in a Crystallizer to produce Crystallized Metal, and finally smelt the Crystallized Metal in an ordinary Furnace (or Electric Furnace, Powered Furnace etc) to obtain usable metal ingots.

The yield percentages for Factorization are based on long-term average use, Factorization machines do not keep track of partial amounts of output produced over time, but seem to have a chance to output bonus products at each stage of processing. An example would be that a Crystallizer has a 120% yield of Crystallized Metal from Reduced Chunks, which in practice means that each of the five free input slots will always produce one Crystallized Metal per Reduced Chunk, with a 20% chance to produce a bonus Crystallized Metal. This results in an output of between five and ten Crystallized Metal, but with six being the most likely output amount.

It is also worth noting that except for Galena Gravel, the extra time, effort, and complexity of using a Mixer and Crystallizer results in only a 12% improvement in yield, or one extra ingot per 8.33 ore processed. A simple and quick set-up of a Grinder and Slag Furnace will perform almost as well, while taking much less time, and avoiding the potential server crashes associated with the Mixer (see the Mixer page for more information).