Lignite powder may be used for rheology and filtration controls in water base mud’s and for helping maintain a constant pH. It is especially effective at stabilizing the property of mud’s exposed to high temperatures and contaminations. It is especially effective in high temperature applications and in dispersed systems as a synergistic additive with Lignosulfonate. It can be used in any water base fluid. It is used for thinning and filtration control purpose in water base muds.