(a) It is the duty of the warden to keep a correct account of all moneys received or disbursed by the warden for the penitentiary and to lay before the commissioner of correction, monthly, a detailed statement thereof.

(b) The warden of the Tennessee state penitentiary and the warden of the Brushy Mountain penitentiary shall transmit on or before Monday of each week to the state treasurer all the moneys collected by them from every source and shall forward to the commissioner a detailed statement of the collections.

(c) The state treasurer shall credit the moneys received to separate accounts kept in the name of the institution.

(d)

(1) The funds deposited may be used by the commissioner for the payment of duly authorized purchases of supplies, goods, wares, merchandise and produce used in the maintenance or operation of the institutions, for the payment of salaries, wages and compensation of employees, for the purchase of livestock and equipment for the farms and for new machinery, for machinery repairs, for building and for building repairs and for all necessary and legitimate expenses connected with or incident to the operation of these institutions.

(2) Any new building or new equipment that will exceed one thousand dollars ($1,000) in cost shall be authorized in writing by the commissioner before the expenditures can be made.

(e) Only the surplus after payment of all salaries, wages and expenses shall pass into the general funds of the state and be available for its debts, expenses and uses.