* Miners climb as BHP jumps 1.8% * NSW state sees biggest daily rise in COVID-19 cases for year (Updates to close) July 8 (Reuters) - Australian shares ended modestly higher on Thursday, supported by mining and tech stocks, although concerns over the economic impact of coronavirus-led lockdowns in the country limited gains. The S&P/ASX 200 index rose 0.2% to 7,341.4 at the close of trade. During the session, the benchmark touched its highest level since June 18. Australia’s most populous state, New South Wales (NSW), on Thursday reported its biggest daily rise in locally acquired cases of C...