China's Wang Mingjuan has spoken of her joy after taking gold in the women's 48kg category - the first in weightlifting at the 2012 Olympic Games.

The four-time world champion, 26, went into her first Games as the overwhelming favourite having not been defeated in international competition since winning her first world title in 2002.

Wang's selection for China's dominant weightlifting team remained somewhat of a controversy ahead of London 2012 after she was picked instead of compatriot Tian Yuan, who won the national trials and is the reigning world champion and world record holder.

Yet Wang proved her spot with a gold-medal winning display at ExCeL, recording a combined total of 205 kilograms (snatch 91kg and clean and jerk 114kg).

"I'm very happy and I'm also very excited," Wang said.

Asked whether she felt she could have been caught by her rivals during the competition, she added: "Actually I wasn't thinking much about this.

"I was so focused. I put all my heart into my lifts and made sure I followed my coach's instructions. That's what I was thinking about."

Japan's Hiromi Miyake finished eight kilos behind Wang in the overall standings and, despite missing out on top spot, described her silver medal as "a dream come true".

"I am very, very happy," she added. "For years I have thought whether I could win an Olympic medal and I have done it. It is my third Olympics (2008 sixth place and 2004 ninth) and the other times I haven't been able to do it."

Miyake becomes the third member of her family to claim an Olympic weightlifting medal, with her father Yoshiyuki Miyake taking bronze at the 1968 Games in Mexico and uncle Yoshinobu Miyake a double gold medallist in 1964 and 1968.

Father Yoshiyuki, who has now turned his hand to coaching, has never showed his Olympics bronze to his daughter and remains unsure if she will now get to see it.

"I don't know, maybe," he revealed. "She'll have to find out. I haven't shown her once. I have two children, so perhaps the other one can win a gold medal so we can complete the set."

The bronze medal went to Ryang Chun Hwa, 21, of the Democratic People's Republic of Korea.

Thailand's Sirivimon Pramongkhol, 17, finished fourth while Turkey's Nurdan Karagoz had to settle for fifth, but strong contender Panida Khamsri, struggling with an elbow injury, crashed out early on having failed all three snatch attempts.