The Confederate Nitre and Mining Bureau was a civilian government bureau to provide the Confederate States of America with needed materials such as copper, iron, lead, saltpeter, sulfur, zinc, and other metals. The Bureau oversaw civilian contracts and offered advice, instruction and guidance in the production of these materials. The Nitre and Mining Bureau was also known as "CSNMB", the "Bureau of Nitre" or the "Nitre Bureau". The Niter and Mining Corps was the military division of the Bureau. The Nitre and Mining Bureau was part of the Confederate Ordnance Department, under the supervision of General Josiah Gorgas. The Nitre and Mining Bureau was supervised by General Isaac M. St. John.
The Act establishing the Nitre and Mining Bureau by the Confederate Congress stated: "That said bureau shall consist of one lieutenant colonel as superintendent, three majors as assistant superintendents, six captains and ten lieutenants, in which shall be included the officers of the present nitre corps, who shall have the same pay and allowances prescribed for officers of cavalry of the same grades." General Isaac M. St. John was subsequently made the superintendent of the bureau. Other individuals involved with or associated with the Nitre and Mining Bureau included: George Washington Helme, Joseph LeConte, Nathaniel Thomas Lupton and Richard Sears McCulloh.
The Nitre and Mining Bureau is most known for their production of saltpeter (potassium nitrate) for the Confederacy. Because of the blockade of Southern ports, imported supplies of gunpowder and materials were kept away from the Confederacy, and had to be supplied within their own borders. Priority was given to the manufacture of gunpowder. The Secretary of War for the Confederate States said: "That Military commanders are directed and officers of the Niter Bureau are authorized to seize niter in the hands of private individuals who either decline to sell it or ask more than 50 cents per pound for it.... All quartermasters are directed to give precedence in transportation to niter over all other Government stores. Richmond, April 15, 1862."