=Commercial Control.=--Three companies now produce about three-fourths of the total copper. Two of these are owned by _American capital_ and their product is refined and sold in the United States. Situated near the Arizona border, they have not suffered from the revolution as much as the properties farther south. These two companies are the Greene Cananea Copper Co. (Ryan-Rockefeller, group 3 of Table 38) and Montezuma Copper Co. (Phelps-Dodge, etc.; group 4 of Table 38). The developed reserves at the Montezuma Copper Co. are equivalent to five years at present production and those at Cananea can be considered about the same. Both districts have important possibilities. Near Greene Cananea is another American property, Democrata Cananea, which is a producer of moderate size. The Cananea district is now producing at the rate of over 50,000,000 pounds per annum. Another American property of note is the Teziutlan Copper Co., Puebla, now idle due to revolutions. It has a smelter which normally ships 12,000,000 pounds of blister copper annually to the Anaconda company’s electrolytic plant. Considerable copper is produced at the plants of the American Smelting & Refining Co., which has three copper smelters, one at Matehuala, San Luis Potosi; one at Asarco and another at Aguascalientes, Durango. _French capital_ controls the third important property (among the three most important in Mexico), which is on the peninsula of Lower California. This is the Boleo, owned by the Rothschilds; as it is far removed from the heart of Mexico, operations have not been greatly disturbed. The mine is an old producer with large potential reserves, and the actual developed reserves will maintain present output for six years. The Boleo ore deposits, which are of an uncommon type, are Tertiary sediments that contain 3.5 per cent. copper ore, usually as oxides. Smelters near the mine produce blister copper and matte, which normally is shipped to France. During the war a large part of the blister and matte came to the United States and passed into the hands of the American Smelting & Refining Co. French interests also own the Compagnie d’Inguaran, near Ario, Michoacan. There are large developed reserves, but the property is idle because of political conditions and absence of equipment or rail connections. French capital also controls the Magistral Ameca Co., in Jalisco, where large ore reserves have been developed. This property is also idle due to political conditions. _English capital_ controls the Mazapil Copper Co., which has large plants, including smelters, in Zacatecas and Coahuila. This is one of the largest copper companies in Mexico as well as one of the oldest important mines. It was idle for some time because of the Mexican revolutions, but has been reopened recently.