Get a Quote

whitch patical use for nature gold mining

the social and economic impacts of gold mining

the social and economic impacts of gold mining

Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.

AT the Paris Exhibition of 1867 much interest was aroused by Leschot's invention for cutting through hard rock by diamonds in rapid rotation. Originally intended for use on a small scale, this method was soon applied by Major Beaumont and others to deep boring; and the great improvements made of recent years in the construction of the instruments used, and the large amount of experience that has been gained by their general use in mining districts, have added so much to the importance of the subject of boring, that it is no longer possible to deal with it adequately in a chapter of a general treatise on mining. An independent work is needed. In German, this exists in Tecklenburg's monumental work. In English, however, Mr. Denny's handbook is the first to give a detailed account of the use of modern diamond core-drills in searching for mineral deposits. The work, which covers 158 pages, contains much information of a practical character, including particulars of the cost of apparatus and of working. It is, unfortunately, limited in its scope. South African conditions are alone considered, and the descriptions of the drills are confined to machines made by two American firms. The numerous well-designed drills of English and Continental make are not mentioned. The work cannot, however, fail to be of value to any one contemplating using diamond-drilling machines for the examination of mineral lands in South Africa.

When you visit any website, it may store or retrieve information on your browser, mostly in the form of cookies. This information might be about you, your preferences or your device and is mostly used to make the site work as you expect it to. The information does not usually directly identify you, but it can give you a more personalized web experience. Because we respect your right to privacy, you can choose not to allow some types of cookies. Click on the different category headings to find out more and change our default settings. However, blocking some types of cookies may impact your experience of the site and the services we are able to offer.

These cookies are necessary for the website to function and cannot be switched off in our systems. They are usually only set in response to actions made by you which amount to a request for services, such as setting your privacy preferences, logging in or filling in forms. You can set your browser to block or alert you about these cookies, but some parts of the site will not then work. These cookies do not store any personally identifiable information.

These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.

These cookies enable the website to provide enhanced functionality and personalisation. They may be set by us or by third party providers whose services we have added to our pages. If you do not allow these cookies then some or all of these services may not function properly.

These cookies may be set through our site by our advertising partners. They may be used by those companies to build a profile of your interests and show you relevant adverts on other sites. They do not store directly personal information, but are based on uniquely identifying your browser and internet device. If you do not allow these cookies, you will experience less targeted advertising.

These cookies are set by a range of social media services that we have added to the site to enable you to share our content with your friends and networks. They are capable of tracking your browser across other sites and building up a profile of your interests. This may impact the content and messages you see on other websites you visit. If you do not allow these cookies you may not be able to use or see these sharing tools.

These cookies may be set through our site by ourselves. They may be used by ourselves to build a profile of your interests and show you relevant content or adverts on our sites. They do not store directly personal information, but are based on uniquely identifying your browser and internet device. If you do not allow these cookies, you may experience less personalised content and/or advertising.

These cookies may be set through our site by our advertising partners. They may be used by those companies to build a profile of your interests and show you relevant adverts on other sites. They do not store directly personal information, but are based on uniquely identifying your browser and internet device. If you do not allow these cookies, you will experience less targeted advertising.

We use cookies to make sure that our website works properly, as well as some "optional" cookies to personalise content and advertising, provide social media features and analyse how people use our site. By accepting some or all optional cookies you give consent to the processing of your personal data, including transfer to third parties, some in countries outside of the European Economic Area that do not offer the same data protection standards as the country where you live. You can decide which optional cookies to accept by clicking on "Manage Settings", where you can also find more information about how your personal data is processed.View our privacy policy

Related News
Contact Us

Do you need to know the product price? model? Configuration scheme? Output? Please leave your correct message and we will reply you within 24 hours.

I accept the Data Protection Declaration