In 2007, 296 million metric tons of iron ore were pulled from the mine. The mine is estimated to contain about 18 billion tons of iron ore, plus gold, manganese, copper, and nickel. The Carajas CarajÃ¡s mine sits in The carajas carajÃ¡s (Mountain range Serra) dos carajas CarajÃ¡s. in northeastern brazil
First, it think the phrase should be the net effect. Mixing up affect and effect  is a common error for both learners and native speakers of English. the net effect = the result in light of an important variable.
a result produced by an action. additive effect the combined effect produced by the action of two or more agents, being equal to the sum of their separate effects. adverse effect a symptom produced by a drug or therapy that is injurious to the patient.Bainbridge effect Bainbridge reflex.t may also be a spurious effect when the observed changes are due to causes and correlations common to both. additive effect. the combined effect produced by the action of two or more agents, being equal to the sum of their separate effects.