Du ##lin , from Yulin , also invited friends and family to donate money . 53-year - old started mining last August and installed dual propeller blades . Former miner is now searching for other projects so he can continue .
Du Xiutang , from Yulin , also asked friends and family to donate money . 53-year-old started project last August and invented dual propeller system . Former miner is now looking for other investors so he can continue .