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Quicklime costs $120 per ton. Lime is used in large quantities as a building and engineering material. The rocks and minerals from which these materials are derived, typically limestone or chalk, are composed primarily of calcium carbonate. They may be cut, crushed or pulverized and chemically altered.
For example, the spot price of SO 2 allowances, which had been steady at about $200/ton during the early years of this decade, suddenly spiked to levels of nearly $1,600/ton in late 2005.