The first substantial foreign-owned copper mine was El Teniente, which was bought by the Braden Copper Company but soon taken over by Guggenheim interests because of Braden's lack of capital. The first really big copper mine started with the purchase of a large section of the old Chuquicamata copper mines in 1912 by the Guggenheims which became the Chile Exploration Company. Construction started in 1913 and the first copper was produced in March 1915.
Production was about 19,000 tonnes in 1810, the year the country became independent and climbed to 51,803 tonnes in 1869 whilst it was the world's largest producer then fell away to only 20,253 tonnes in 1892. Therefter there was a gradual improvement to 51,000 tons in 1918, 100,000 in 1923, and 200,000 by 1937. Today, Chuquicamata is the mine that has produced the largest amount of copper in the world (approximately 29 million tonnes), and one of the largest man-made holes in the planet. In 1923, Guggenheim Bros. sold a majority interest in the property to the Anaconda Copper Mining Company, who bought the bulk of the remainder in 1929.
Three other mines were eventually nationalised, Cerro de Pasco's Andina operation, which went to Codelco, and the two mines, Los Bronces and El Soldado, owned by Peñarroya's Disputada de las Condes, which were bought by ENAMI. Evidently these mines did not fit in with ENAMI's plans and Disputada de las Condes was subsequently sold (at a substantial profit) to Exxon Minerals.
During the administration of President Eduardo Frei Montalva, Congress sanctioned law 16.425 on January 25, 1966 and transformed the Copper Office into the Copper Corporation of Chile (Codelco). The principal objective was to increase state control over the copper industry. It also authorized the government to participate directly and invest in new and existing operations.
Based on this law, the government invested in the newly discovered La Exotica mine on February 10, 1967. The La Exotica mine was jointly owned and developed by the Anaconda Copper Company (75%) and the Chilean government (25%). More importantly, in that same year, the Chilean government acquired the majority of shares (51%) of the El Teniente mine, with the remaining 49% left in the hands of the Kennecott Copper Corporation.
This process was known as negotiated nationalization, and was designed to avoid a conflict with international investors (and ultimately with the United States), and to allow for the acquisition of the technical, financial and marketing knowledge of the multinationals. A similar process was used to acquire a dominant ownership over the rest of the copper industry.
In the agreement, it was established that the Chilean government could buy within the next 13 years (counting from 1970) the remaining 49% of the foreign ownership from the multinational corporations, but only after having paid at least 60% of the current debt due from the purchase of the original 51%. It also fixed a clear formula for the valuation of the assets to be bought, for the liquidation of profits, for the increase of direct investment in new works, and related issues.
In the 1970 presidential election, the outright nationalization without compensation (known as the Chilenization of copper) became one of the basic campaign issues. Two out of the three presidential candidates incorporated the idea into their political platforms, while the third opted for a faster version of the "negotiated nationalization".
After socialist candidate Salvador Allende won the election, he promised to deal with the issue head-on. In fact, at the beginning of 1971, he sent Congress a project for a constitutional amendment that would allow him to nationalize outright all mines, and to transfer all present and future copper fields to the state. Congress passed this amendment on July 11, 1971, by a unanimous vote, and based on it, on July 16, 1971 law 17.450 was promulgated, and became effective immediately. The event was celebrated as the Day of National Dignity (Día de la Dignidad Nacional).
In principle, there was complete agreement about the process of nationalization of the mines among all political parties represented in the Chilean Congress, as indicated by the unanimous vote that approved law 17.450. When it came down to the particulars, however, there was much concern about the political use that the Allende administration would make of it. Even so, the bigger concern was for the expected reaction of the US Government.
In October 1971, the General Controller's office handed down the calculations of the indemnizations due, in line with the parameters established by the Constitutional Amendment. According to this document, the American companies were not to receive any compensation for the Chuquicamata, El Salvador and El Teniente mines, and only a very small one for the rest of their properties. The US government reaction was immediate. The US Department of State declared: "This serious infraction to international practice can cause damage not only to Chile, but to all other developing countries".
Article 1 of the Chilean Mining Code states that "The State has absolute, exclusive, inalienable and imprescriptible ownership of all mines" but goes on to say that anyone may prospect for and establish concessions or mining rights for the search or mining of substances. It appears that anyone may apply, including boys down to the age of 15 and girls down to the age of 13. As well as the Mining Code, foreign investors have to observe Decree Law No. 600 which deals with foreign investment and investment contracts. This allows tax invaribility for 10 years from start of production, access to the foreign exchange market and the right to return capital actually brought into the country without being taxed. The tax invariability can be extended to 20 years for companies bringing in US$50 million or more. In return for these concessions foreign investors have to pay a combined tax rate of 42% compared with the current 35%. They may change, but once only, to the current mining tax regime but most have opted for the higher tax rate because gives more certainty to financial planning.
On June 16, 2005, Law 20.026 was published in Chile's Official Gazette ("Diario Oficial"). The Law establishes a specific tax on mining activities, which will come in force on January 1, 2006 consisting of a sliding scale according to copper production from nothing below 12,000 tonnes p.a. to 5% above 50,000 tonnes p.a. on production in excess of 12,000 tonnes p.a. Foreign companies that signed a DL 600 contract before Dec 1 2004 and are still liable to 42% tax are not affected by this. Companies bringing in US$50 million or more now can be granted invariability of mining taxation but must pay normal income tax. They must also submit their annual financial statements to external audit and to the Securities and Insurance Supervisor as well as their quarterly statements and an annual report on the property.
A fact not widely appreciated is that mining companies are generally granted generous concessions to allow them to recoup their initial capital expenditures because of the very risky nature of mining. This gives rise to a long initial tax free period and the suspicion that they are avoiding tax. The most important of these in Chilean law are organisation and startup expenses,interest expense,technical assistance,tax losses and asset depreciation, which may be accelerated. This explains why it was some years before Escondida started to pay tax.