English to Spanish Tech/Engineering Metallurgy / Casting

Hola, que quiere decir esa palabra ya que "ensayan" no me calza. En contecto: "Widely used until recently, iron consumptions have been in the range of 1.5 to 3 lbs/lb of cement copper product, which may assay from 60% to 90% metal, and must be melted..."
Ojalá me puedan ayudar, chao que les vaya bien.