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Ken Lane's book "The Economic Definition of Ore" is a standard reference work within the mining industry. Elaborating on his theory originally developed in 1964, this book provides a thorough and comprehensive description of both the theory and practice of implementing cut-off grades within a mining operation.

The Economic Definition of Ore: Cut-off Grades in Theory and Practice

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If you’re a car or motorcycle enthusiast, then you will love all the available auto &amp; cycles magazine subscriptions at DiscountMags. We offer the best magazines with information about your favorite car or motorcycle topics. Whether you are looking for a magazine on the newest cars and bikes, off-road machines, dirt bikes, trains, or anything else with a motor, you can find any publication that you are looking for right here.

We have tons of auto and cycle magazine subscriptions dedicated to working on cars, specific makes and models, four-wheelers, trucks, vintage and classic vehicles, and many other topics that will be of interest to any car or motorcycle enthusiast. Learning more about your hobby is easier than ever when you have such a wide selection of motorcycle and car magazine subscriptions at your fingertips. Find the publication that is perfectly suited to your specific interests on DiscountMags today.

Auto & Cycles

If you work in the business world or merely enjoy keeping up with all the various companies that impact your day-to-day life, then you will appreciate DiscountMags broad selection of business &amp; finance magazines online. There are publications for each and every business-minded person, from CEOs to those that would just like to have access to the gist of the financial world. Whether you are looking for a periodical that will help you become a better entrepreneur and grow your business or would like a general business periodical that will provide you with information about all the biggest companies in the United States and throughout the world, this category of magazines will provide you with any periodical for which you are looking. You will enjoy reading any and all of the business and finance magazines that are available at DiscountMags. Each of these publications is intent upon providing you with the latest news and information to ensure that you are an informed consumer and businessperson. There are business magazines for everyone at DiscountMags; find yours today.&nbsp;

Business & Finance

<span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap;">DiscountMags has an excellent selection of children’s magazines available online with numerous publications available for boys and girls of all age groups. There are educational publications, activity and sports magazines, those dedicated to preteen and teen fashion, literary periodicals, and many other types of kid’s magazines that are related to the specific interests of your child.&nbsp;


It doesn’t matter what kind of children’s magazines that you are looking for; you will be able to find the best one for your child at DiscountMags. There are also many magazines available that feature your child’s favorite animated or storybook characters so they can enjoy their favorite characters anytime and anywhere. With our exceptional selection, it will be easy for you to pick a kid’s magazine subscription that your son or daughter will love.

Children's

DiscountMags has many fantastic computers &amp; electronic magazines online for the convenience of its customers. You will enjoy having access to so many great periodicals that can help you with any of your technological needs. There are numerous computers and electronic magazine subscriptions that will help you become more fluent with technology, whether you work with computers everyday at work or you enjoy tinkering with electronics in your free time, there is a great publication for you at DiscountMags. Each of these periodicals can help you learn more about the technology in which you are most interested. There are a wide array of periodicals available at DiscountMags from those that are dedicated to PC gaming, publications that provide you with informative reviews about the latest technology on the market, to those specifically published to help you better understand your Mac or PC operating system, you will find all the electronics and computer magazines that you need here at DiscountMags.&nbsp;

Computer & Electronic

If you enjoy keeping up with all the latest news and events that are related to the entertainment industry, then you will love DiscountMags’ selection of entertainment &amp; TV magazines online for its customers. There are many different periodicals that are offered so that you can find the one that is best suited to your particular interests. There are entertainment magazines that are dedicated to providing you with the latest gossip about the lives of various actors and actresses and fashion trends, while others are more focused on what is happening on television and in theaters, there are even those with a mix of the two. Whether you want to stay up to date with the latest events in your favorite actors’ lives or you are interested in the movie industry, you will be able to find the perfect publication for you at DiscountMags. You will enjoy reading any of the entertainment and TV magazine subscriptions that you choose from this category.&nbsp;

Entertainment & TV

You will appreciate being able to choose from all of the family and parenting magazines online at DiscountMags. There are publications that have stories that are meant to be read as a family, those that will help you learn about being parent, others that are meant to help you know what to expect when you are expecting a child, as well as many other publications that are beneficial for families to have. Whether you are looking for a literary or educational periodical that you can read to your children or you would like one that will help you through any parenting issues that you may come upon, you can find the perfect family magazines for you and your family at DiscountMags. From your first pregnancy to sending your child off to college, there are parenting magazine subscriptions available that will help you through any family situation. DiscountMags can meet every magazine need that you have.&nbsp;

Family & Parenting

This category of food &amp; beverage magazines online at DiscountMags will ensure that you have access to high-quality information about all of your favorite foods and beverages. Whether you are looking for publications that will help you learn more about brewing beer and making wine or you would like a periodical that will provide you with interesting new recipes to make for your family and friends, you can find all of this and more on this website. There are food magazines available that are dedicated to clean eating, vegetarian meals, as well as ethnic and regional foods. You will enjoy having a magazine that matches your personal preferences in cuisine. There are also many beverage magazine subscriptions that will provide you with an education in the history of wine and others that are dedicated to the art of beer brewing. Regardless of your unique interests, you will find a magazine to suit your needs at DiscountMags.&nbsp;

Food & Beverage

You will enjoy having access to a large selection of health &amp; fitness magazines online at DiscountMags. These periodicals will provide you with the information and support that you need to meet all of your health and fitness goals. Whether you are looking to amp up your weight training routine or are completely new to working out and eating healthy, you will find all that you need in any of the publications that are offered in this category. There are health &amp; fitness magazine subscriptions for those who are training to compete in a bodybuilding competition, those that focus on natural health solutions, some are dedicated to particular types of exercises such as running or yoga, as well as many other focuses. There is a periodical for everyone at DiscountMags. If you would like to receive tips and advice specific to your gender, you can even find magazines that are published just for men or women. No matter what type of health magazines you are looking for, you will find the one for you at DiscountMags.&nbsp;

If you enjoy making your house and garden homier through projects and décor, then you will appreciate the selection of home &amp; garden magazines online at DiscountMags for its customers. There is a vast selection of periodicals available to ensure that you can find the perfect magazine to fit your needs and interests. Whether you are a handyman who would like to read a periodical filled with great ideas for new projects for your house or you enjoy baking and decorating your house, you will find great publications for both of these and many other interests. DiscountMags has home &amp; garden magazine subscriptions that are related to specific home styles, arts and crafts, organic gardening and farming practices, art, and many other topics. There are many home magazines that you will love at DiscountMags, the only difficult part will be deciding which one you want a subscription to the most.&nbsp;

Home & Garden

<span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap;">There are many fantastic magazines for men online at DiscountMags. From publications dedicated to fashion to those magazines published just for adults, there is a varied selection of periodicals available for you to browse. It doesn’t matter what kind of magazine you’re looking for; you’ll be able to find the perfect one for your taste.&nbsp;

Within this diverse selection of men’s magazine subscriptions, you’ll find periodicals about DIY projects and ideas, fashion, health and fitness, cars, hiking, sports, hunting and fishing, politics, and much more. Regardless of which subscription you choose to order, you’re guaranteed to receive a high-quality magazine with features that you’ll enjoy reading. There are magazines available for every type of man at DiscountMags.

Men's

At DiscountMags, you will find many great news &amp; politics magazines online that will provide you with information about current events that you will enjoy reading when you have free time. If you are interested in staying up to date and informed about the latest current events, then you will benefit from having a subscription to any of the periodicals available in this category. From bi-monthly to weekly magazines, you will be able to choose the publication that is best suited for your needs. You will enjoy having the opportunity to read about politicians, foreign affairs and policies, terrorist attacks, sports, and other news. You will enjoy reading and learning about all the various topics in which you are interested through these news and politics magazine subscriptions. It will be easy for you to find great news magazines that will provide you with interesting reading in this category at DiscountMags.&nbsp;

News & Politics

There is a vast selection of science &amp; nature magazines online at DiscountMags for those who enjoy reading and learning about these subjects as well as topics that are related to them. In this category you will find that there are many different types of publications available. You will be able to read general science periodicals as well as those that are dedicated to specific fields of study such as astronomy or archaeology. You will also find many science magazines that feature works of fiction that you will enjoy reading. There are also many nature magazine subscriptions available that will help you learn about the world around you. Whether you are looking for a regional periodical or a general nature publication, you will be able to find exactly what you are looking for. DiscountMags even has magazines specifically for children and adults so that your child can enjoy learning about nature and science if that is an interest that he or she has. Find great magazines for you and your family at DiscountMags.&nbsp;

Science & Nature

There are many sports &amp; recreation magazines online at DiscountMags that will provide you with leisurely reading dedicated to all of your favorite recreational activities. There are periodicals that are focused on running, golf, bicycling, tennis, boating, dancing, and many other great activities that you may enjoy. You are guaranteed to find a publication that matches your interests in this broad category of magazines. It does not matter what you are interested in, there are periodicals available that will ensure that you will have the opportunity to read and learn about any activity in which you enjoy participating. In each of these recreation magazine subscriptions, you will be able to find tips and suggestions that will help you become better participant in the activity or sport of your choice. DiscountMags provides excellent quality recreational and sports magazines so that every customer is satisfied. Find a great magazine for you today.&nbsp;

DiscountMags has a vast selection of travel &amp; leisure magazines online for those who enjoy traveling and adventuring around the world. You will enjoy finding the best magazine based on what interests you about the world around you that you have yet to explore. There are periodicals dedicated to backpacking and hiking, island life, cities and states, cruises, traveling after retirement, motor homes, and many other topics. With the help of the available travel and leisure magazine subscriptions, you will have the ability to learn about opportunities and suggestions for traveling both near and far. It does not matter whether you are looking take an adventurous camping trip with your family or you are hoping to find the perfect resort somewhere tropical, you will be able to find the perfect periodical based on what type of vacation you are interested in taking. There are many great travel magazines at DiscountMags; you only have to choose the one that is best suited to the interests of you and your travel companions.&nbsp;

Travel & Leisure

DiscountMags provides its customers with numerous magazine subscription bundles that will save you money while providing you with all of the publications that you enjoy reading the most. Each of the bundles takes into consideration similar magazines that are frequently bought together by the same customers so that you never have to choose between two periodicals that you want to purchase. You will be able to enjoy reading all of your favorite magazines because of each DiscountMags bulk magazine sale available.&nbsp; Whether it is a children’s bundle, a fashion bundle, or two men’s magazines, you can find one that you will enjoy reading at DiscountMags. Each bulk magazine sale ensures that you are able to get both the magazines that you want at a great price that cannot be beat. You will love having access to all the phenomenal bundles at DiscountMags. Find the perfect magazine subscription bundles for you and your family today.&nbsp;

Value Bundles

<span style="font-size:11pt;font-family:Arial;color:#000000;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap;">There are numerous magazines for women online at DiscountMags that you will find enjoyable to read. You will find publications dedicated to topics such as fashion, style, health, fitness, wedding planning, pregnancy, cooking, and much more. There are women’s magazine subscriptions for every type of woman and every kind of interest. From O, The Oprah Magazine, Women’s Health, Vogue, and a variety of other great women’s magazines, there is something for everyone.&nbsp;

You’ll also find ethnic periodicals and a variety that are published in different languages so you can find the perfect magazine that fits your culture and your interests. With the help of DiscountMags, you’ll have no trouble finding a great women’s magazine for you. Choose your subscription today!