What is the material collected from reverberatory furnace in the metalurgy of copper ?

In the reverberatory furnace :

White adding the raw materials into the reverberatory turnace for the extraction of copper, it Is forgotten to mix sand. Predict the result of this mistake.

Statement-1:Silica is added as a flux in reverberatory furnace, in the extraction of copper from copper pyrites. Statement-2:Silica acts as basic flux.

Assertion: Silica is added as a flux in reverberatory furnace, in the extrcation of copper from copper phyrites. Reason: Silica decreases the melting point of the ore and increases the conductivity.

Assertion: In extraction of copper from chalcopyrite after roasting in supply of air ai moderate temperature, the temperature of the roasting ore is increased above the fusion temperature and then silica is added in reverberatory furnace. Reason: In the extraction of copper from chalcopyrites during smelting, the impurity of iron is removed as fusible slag (FeSIO_(3)) in blast furnace or reverberatory furnace.