How to write a letter

Xxx: or respected xxx agency

I am now reporting the mine owner of the unlicensed mining site. This mineral is privately occupied by our farmers' mountains. The washing water is discharged into the water and rivers without treatment, which seriously affects the production of crops and the water quality of the river. The farmers stopped to be driven by the miners.

And the village officials who have ignored these unlicensed mining sites and the town officials above.

Specifically, there is the following evidence:
1.
evidence
2.
evidence
3.
evidence

...........

I hope to pay attention to it according to the national law.

Reporter xxx

Informer:
year month day