(3 sext.) Cadmium Metal ¹⁴
a. The price of cadmium metal shall be posted at the price per metric ton based on the monthly average market price of cadmium metal, containing cadmium no less than ninety-nine point nine five percent, in London, England, where the transactions are made.

However the cost of transportation and insurance from the port in London to the port in Bangkok shall be deducted at the rates prescribed by the Director-General.

b. Whenever there is a fluctuation in market price over or under that latest posted in excess of four hundred baht per metric ton, it shall be re-posted.

(3 septem.) Marble and Dimensional Granite ¹⁵
a. The price of marble and dimensional/decorative granite shall be posted at the price per cubic meter, based on the average value of total reserves of marble or dimensional granite, as the case may be, calculated by using the steps and methods prescribed by the Director of Primary Industries and Mines.

b. In every period of a calendar year, the price of marble and dimensional granite shall be re-posted.
(4) Other Kinds of Minerals
a. The price of minerals other than those under (1), (2), and (3) and minerals otherwise prescribed by Ministerial Regulations shall be posted at the price per metric ton, depending upon the type and nature of such minerals, based on the latest average price in Bangkok, where the transactions are made.
b. In case of mineral production for domestic industries, inventions, or energy other than metallurgical works, the price shall be posted based on the domestic average buying prices of the consumers depending upon the type and nature of such minerals.
c. Whenever the latest posted price of any kinds and forms of mineral, being less than one thousand baht per metric ton, fluctuates over or under the posted price in excess of thirty baht per metric ton, it shall be re-posted.
d. Whenever the latest posted price of any kinds and forms of mineral, being between one thousand baht and ten thousand baht per metric ton, fluctuates over or under the posted price in excess of fifty baht per metric ton, it shall be re-posted.
e. Whenever the latest posted price of any kinds and forms of mineral, being more than ten thousand baht per metric ton, fluctuates over or under the posted price in excess of four hundred baht per metric ton, it shall be re-posted.

Section 3 Determination of the rates for currency exchange in order to calculate the mineral market prices shall be prescribed as follows:¹⁶
(1) In case that the par value of the baht is prescribed, it shall be applied as the set value in calculating the rate for currency exchange. A fraction of one satang shall be discarded.
(2) In case that the par value of the baht is not prescribed, the average of the current buying and selling rates of such foreign currency posted daily by the Exchange Equalization Fund shall be applied in calculating the rate for currency exchange.

Section 4 Procedures for the control of payment of mineral royalties shall be prescribed as follows: ¹⁷
(1) Payment of Royalties on Tin shall be collected according to its actual metal content based on the result of analysis carried out by the Department of Primary Industries and Mines or a tin smelting plant, or an institute approved by the Department of Primary Industries and Mines.

In case tin analysis has not yet been carried out, the principle to be based on shall be such that tin content is seventy-two percent except where a certificate is issued by the Department of Primary Industries and Mines to the effect that tin content does not exceed fifty percent or not exceed thirty-five percent, in such case it shall first be assumed that the tin content is fifty percent or thirty-five percent, as the case may be.

(2) Payment of Royalties on Tantalite and Columbite compounds shall be collected according to the content of tantalum pentoxide compound based on the result of analysis carried out by the Department of Primary Industries and Mines or an institute approved by the Department of Primary Industries and Mines.

In case that the analysis of tantalite and columbite compounds has not yet been carried out, the principle shall be based on such that tantalum pentoxide compound content is thirty percent, except when a certificate is issued by the Department of Primary Industries and Mines that tantalum pentoxide compound content does not exceed twenty percent or not exceed ten percent, in that case it shall first be assumed that the tantalum pentoxide compound content is twenty percent or ten percent, as the case may be.

(3) Payment of Royalties on slag containing Columbium Pentoxide or Tantalum Pentoxide or combination of both shall be collected at the rates prescribed under the item 2(a) of (3 quarter.) based on the result of analysis carried out by the Department of Primary Industries and Mines or an institute approved by the Department of Primary Industries and Mines.

In case that the analysis of the slag containing columbium pentoxide or tantalum pentoxide, or combination of both has not yet been carried out, the principle shall be based on such that tantalum pentoxide compound content is thirteen percent, except when a certificate is issued by the Department of Primary Industries and Mines that tantalum
pentoxide compound content does not exceed eight percent or not exceed five percent, in that case it shall first be assumed that tantalum pentoxide compound content in the slag containing columbium pentoxide, or tantalum pentoxide, or combination of both, is eight percent or five percent, as the case may be.

(4) Payment of Royalties on Lead shall be collected according to its actual lead content based on the result of analysis carried out by the Department of Primary Industries and Mines or an institute approved by the Department of Primary Industries and Mines.

In case that lead analysis has not been carried out, the principle shall be based on such that lead content is eighty percent, except when a certificate is issued by the Department of Primary Industries and Mines that lead content does not exceed sixty-five percent or not exceed fifty percent or not exceed thirty-five percent, in that case it shall first be assumed that the lead content is sixty-five percent or fifty percent or thirty-five percent, as the case may be.

(5) Payment of Royalties on Zinc shall be collected according to actual zinc content based on the result of analysis carried out by the Department of Primary Industries and Mines or an institute approved by the Department of Primary Industries and Mines.

In case that zinc analysis has not yet been carried out, the principle shall be based on such that zinc content is fifty percent, except when a certificate is issued by the Department of Primary Industries and Mines that zinc content does not exceed forty percent or not exceed thirty percent, in that case it shall first be assumed that the zinc content is forty percent or thirty percent, as the case may be.

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14 As added by the Ministerial Regulation No. 51 (B.E. 2538).
15 As added by the Ministerial Regulation No. 51 (B.E. 2538).
16 As amended by the Ministerial Regulation No. 19 (B.E. 2522).
17 As amended by the Ministerial Regulation No. 22 (B.E. 2523) and added by the Ministerial Regulation No. 36 (B.E. 2529), No. 46 (B.E. 2536), and No. 51 (B.E. 2538).