Shares in White Cliff Minerals (ASX:WCN) have jumped 24% as the company flags hitting copper rock chips with extremely high grades in Canada. While rock chips are often high in concentration – consider that a rockchip will only be visible during an on-the-ground campaign due to their ‘shiny’ nature – White Cliff’s rock chip grades go well above what many other projects report. Also consider that White Cliff’s latest samples were taken from metal vein systems spotted by geotechs on-site the company’s Rae project. As for results, the company unveiled the following rock-chip sample copper and sil…