- The leaching rate can be increased if the particle size is small. Big particle size needs to go through the grinding process so can produce fine particle size or need help from the stirrer to increase the leaching rate for big particle size.

- The particle need to be more soluble in the solvent compare to solute.

- The solubility of the solute in the solvent increases with an increase in temperature. The mobility or diffusivity of the solute in the solvent increases with increase in temperature. The viscosity of the liquid decreases with an increase in temperature, this lowered viscosity helps in increased mobility of the solute through the liquid or the solvent.

- The general effect of agitating the solid-liquid solution is that the solid-liquid mass transfer coefficient increases with an increase in agitation but care should be taken that the inert solid doesn’t get disintegrated. If most of the mass transfer resistance lies in the interior of the solid then agitation will not have much effect on the leaching process.

- Bacterial leaching is the extraction of metals from their ores using microorganisms. The most important player in the bioleaching process is Acidithiobacillus ferrooxidans. It is a chemoautotrophic acidophile, meaning that it obtains its energy from inorganic sources and fixes its own carbon while growing in an acidic medium. Its unique ability to oxidise ferrous to ferric, and sulphur and reduced sulphur compounds to sulphuric acid, leads to leaching of metals from their oxide and sulphide ores.  Ferric sulphate is a strong oxidising agent capable of dissolving a wide range of metal sulphide minerals. Leaching brought about by ferric sulphate is termed indirect leaching because it proceeds in the absence of both oxygen and viable bacteria. 

- In the process of mineral leaching, the main factors affecting the leaching rate of gold ore are the concentration of cyanide and oxygen, ore properties, gold particle size, pulp pH value, slurry content, pulp concentration, leaching temperature, and mineral leaching time. Some gold-bearing ores should not be directly treated by cyanide leaching. The high content of copper, arsenic, antimony, bismuth, and other components in the ore will greatly increase the cyanide consumption or consume the oxygen in the pulp and reduce the gold leaching rate. In addition, if the carbon content in the ore is high, the carbon will adsorb the dissolved gold and lose with the tailings. At this time, the influence of harmful impurities can be eliminated by pre-oxidation roasting or flotation.

- If the intermediate products help the process, it improves efficiency; but, if they attach to either of them and slow down the process, it reduces efficiency. As a result, it is dependent on the intermediate product that is produced.

- Depending on the path available for the solvent to reach and dissolve the solute. Smaller crystals, for example, have a larger contact area, resulting in greater efficiency. The efficiency of similar shapes that allow for greater contact will be higher.