An introduction to geology
An introduction to geology

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Free course

An introduction to geology

2.19 How much ore for a metre of Cu cable?

How much copper ore do you need for 100 m of cable? 100 m of typical 3-core copper cable for electrical wiring weighs about 2 kg. Using this information, complete the activity below.

Activity 2.4 Cu cable

Timing: Allow about 5 minutes

At the Parys mine there is about 3,031,000 tonnes of copper ore, and there is 10.1 g copper per kg of ore (1.01%). How much ore from Parys Mountain needs to be mined to make a 100 m cable?

a. 

198 kg


b. 

20.2 kg


c. 

267 kg


The correct answer is a.

Discussion

The answer is 198 kg. The calculation required for this is:

two postfix times equation left hand side k times g postfix times o times f postfix times cap c times u postfix times equals right hand side equation left hand side 2000 times g divided by 10.1 postfix times g solidus k times g equals right hand side 198 postfix times k times g postfix times o times r times e

OUFL_1009

Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to University-level study, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus371