Mine (as a noun) refers to a location where minerals or other substances are extracted.

खदान

English Usage: The coal mine provided jobs for many local families.

Hindi Usage: कोयला खदान ने कई स्थानीय परिवारों को नौकरियाँ प्रदान की।

Watching refers to the act of looking at something attentively or observing.

देखना

English Usage: She was watching her favorite movie on television.

Hindi Usage: वह अपनी पसंदीदा फिल्म को टेलीविज़न पर देख रही थी।

Mine (as an adjective) is used to indicate possession, referring to something that belongs to the speaker.

मेरा

English Usage: That book is mine.

Hindi Usage: वह किताब मेरी है।