Forges and Siemens-Martin Works.

MINES AND ORES. The fundamental requisites for the manufacture of good pig-iron are high-class iron ore and the best quality charcoal. The Sandviken Iron Works Company has long been a share-holder in several mines supplying first-class iron-ores, the principal being the Bispberg-, Kolningberg- and Svartvik Mines, the product of which is reckoned to be among the best ores for steel-making of the country. During the last few years, the Company has been clearsighted enough to buy shares in several other mining fields, such as those of Tuolluvara (in Lapland), Stripa, Västra Ormberget, Björnberget etc. We append some analyses of the ores, the figures standing for percentages: <table> <td><tab><td>Bispberg<td>Kolningberg<td>Svartvik<td><tab><td>Bispberg<td>Kolningsberg<td>Svartvik <td>Fe2O3<td>8.15<td><tab><td><tab><td>Al2O3<td>0.96<td>1.22<td>0.41 <td>Fe3O4<td>82.39<td>58.16<td>60.86<td>SiO2<td>7.28<td>4.40<td>8.88 <td>FeO<td><tab><td>6.38<td>1.16<td>Fe<td>65.40<td>47.10<td>45.00 <td>MnO<td>0.34<td>6.56<td>1.88<td>P<td>0.004<td>0.003<td>0.005 <td>MgO<td>1.10<td>5.14<td>1.80<td>S<td>0.007<td>0.056<td>0.022 <td>CaO<td>0.88<td>4.00<td>12.03 </table>