Metallic gold is frequently found in aluminosllicate rocks and it is finely dispersed among other minerals.It may be extracted by treating the crushed rock with aerated potassium cyanide solution.During this process metallic gold is slowly converted to `[Au(CN)_2]^(-)` , which is soluble in water.After equilibrium has been reached.the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to `[Zn(CN)_4]^(2-)`. Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution.Silver occurs as native as well as sulphurised ore.
Which of the following statements is correct ?

Options

A. Leaching of gold with `CN^-` is an oxidation reaction
B. Argentite is oxide ore of silver
C. In the precipitation of gold from the soluble complex, zinc acts as complexing and reducing agent
D. (A) and (C ) both

Explanation

To solve the question regarding the extraction of metallic gold and the associated reactions, we will analyze the provided information step by step.

### Step-by-Step Solution:

1. **Understanding the Extraction Process**:
- Metallic gold is extracted from aluminosilicate rocks by treating crushed rock with an aerated potassium cyanide solution. This process is known as leaching.

**Hint**: Remember that leaching is a method used to extract metals from ores by dissolving them in a solvent.

2. **Formation of Gold Complex**:
- During the leaching process, metallic gold (Au) is oxidized and converted into a soluble complex, specifically `[Au(CN)_2]^-`. This complex is soluble in water, allowing for the separation of gold from the ore.

**Hint**: Focus on the chemical transformation that occurs during the leaching process, particularly the formation of the soluble gold complex.

3. **Recovery of Gold**:
- After the equilibrium is reached, the aqueous phase containing the gold complex is pumped off. The gold is then recovered by reacting the gold complex with zinc (Zn), which leads to the formation of `[Zn(CN)_4]^{2-}` and precipitates metallic gold.

**Hint**: Consider the role of zinc in the recovery process and how it interacts with the gold complex.

4. **Analyzing the Statements**:
- The question asks which of the following statements is correct based on the provided information.
- The first statement claims that the leaching of gold with CN^- is an oxidation reaction. This is true because gold is oxidized to form the complex.
- The second statement claims that argentite is an oxide of silver. This is incorrect; argentite is actually Ag2S (silver sulfide).
- The third statement states that in the precipitation of gold from the soluble complex, zinc acts as a complexing agent. This is also correct since zinc facilitates the recovery of gold from its complex.

5. **Conclusion**:
- Based on the analysis, the correct statements are:
- The leaching of gold with CN^- is indeed an oxidation reaction.
- Zinc acts as a complexing agent in the precipitation of gold.
- Therefore, the correct answer is that both the first and third statements are correct.

### Final Answer:
The correct statements are:
1. The leaching of gold with CN^- is an oxidation reaction.
2. In the precipitation of gold from the soluble complex, zinc acts as a complexing agent.