Write the chemical reactions involved in the extraction of metallic silver from argentite.

Explanation

To extract metallic silver from argentite (Ag2S), the following chemical reactions are involved in the cyanide process:

### Step-by-Step Solution:

1. **Reaction of Argentite with Sodium Cyanide:**
The first step involves the treatment of argentite (silver sulfide, Ag2S) with sodium cyanide (NaCN). This reaction forms sodium argentocyanide complex and sodium sulfide as a byproduct.

**Chemical Reaction:**
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