Notes To Consolidated Financial Statements of revenues in at least one of the past three years is  PT Smelting with 29 percent in 2004, 23 percent in 2003  and 20 percent in 2002. FCX revenues attributable to various countries based on  the location of the customer follow (in thousands): Through its operating subsidiaries, FCX markets its  products worldwide primarily pursuant to the terms of long- term contracts. As a percentage of consolidated revenues,  revenues under long-term contracts totaled approximately 96  percent in 2004 and 95 percent in 2003 and 2002. The only  customer under long-term contracts with over ten percent  FCX revenues attributable to the products it produces follow (in  thousands): a. Amounts are net of treatment and refining charges totaling $175.9 million for 2004, $1 79.1 million for 2003 and $215.8 million for 2002. Proven and probable reserves were determined by the use of  mapping, drilling, sampling, assaying and evaluation methods  generally applied in the mining industry, as more fully  discussed below. The term “reserve,” as used in the reserve  data presented here, means that part of a mineral deposit  which can be economically and legally extracted or produced  at the time of the reserve determination. The term “proven  reserves” means reserves for which (a) quantity is computed  from dimensions revealed in outcrops, trenches, workings or  drill holes; (b) grade and/or quality are computed from the  result of detailed sampling; and (c) the sites for inspection,  sampling and measurements are spaced so closely and the  geologic character is sufficiently defined that size, shape,  depth and mineral content of reserves are well established.  The term “probable reserves” means reserves for which  quantity and grade are computed from information similar  to that used for proven reserves but the sites for sampling  are farther apart or are otherwise less adequately spaced.  The degree of assurance, although lower than that for proven  reserves, is high enough to assume continuity between  points of observation. All of PT Freeport Indonesia’s current aggregate (including  Rio Tinto’s share) proven and probable reserves, shown below,  are located in Block A of PT Freeport Indonesia’s Contract  of Work. The initial term of the Contract of Work covering  Block A expires at the end of 2021. PT Freeport Indonesia can  extend this term for two successive 10-year periods, subject  to the approval of the Indonesian government, which cannot  be withheld or delayed unreasonably. PT Freeport Indonesia’s  reserve amounts reflect its estimates of the reserves that can  be recovered before the end of 2041 (the expiration of the two  10-year extensions). PT Freeport Indonesia’s current mine plan  has been developed and its operations are based on receiving  the two 10-year extensions. As a result, PT Freeport Indonesia  does not anticipate the mining of all of its reserves prior to  the end of 2021 based on its current mine plan, and there can  be no assurance that the Indonesian government will approve  the extensions. Prior to the end of 2021, under its current  mine plan PT Freeport Indonesia expects to mine approximately  47 percent of aggregate proven and probable ore, representing  approximately 55 percent of its share of recoverable copper  reserves and approximately 69 percent of its share of  recoverable gold reserves. Note 13. Supplementary Mineral Reserve Information (Unaudited) 78 |  FREEPORT-McMoRan COPPER & GOLD INC. 2004  2003  2002 Indonesia (PT Smelting)  $ 696,022  $ 510,245  $ 391,071 Spain 490,647  372,791  378,817 Japan 414,386  412,404  342,899 Korea 142,924  69,134  79,352 Switzerland  64,145  130,518  146,062 Others 563,742  717,073  572,261 Total $2,371,866  $2,212,165  $1,910,462 2004  2003  2002 Copper in concentrates$^{a}$  $ 996,331  $ 612,443  $ 599,358 Gold in concentrates  516,554  685,230  546,048 Silver in concentrates  17,091  16,374  14,740 Refined copper products  716,959  603,177  532,769 Gold and silver in slimes  124,383  272,050  209,136 Royalties  (43,498)  (26,472)  (24,532) Sulphur and other  44,046  49,363  32,943 Total $2,371,866  $2,212,165  $1,910,462