The binding legal principles established are: (1) When interpreting an agreement for tax purposes, courts must construe the agreement as a whole against the background of surrounding circumstances, focusing on substance over form; (2) Income derived from the systematic exploitation of natural resources on land, received through multiple transactions over an extended period, constitutes revenue rather than capital gain where it is designedly sought and worked for; (3) The multiplicity of payments received from what is structured as ongoing tranches of sales evidences the operation of a business for profit-making rather than a single capital transaction; (4) Under section 82 of the Income Tax Act 58 of 1962, the burden rests on the taxpayer to prove on a preponderance of probability that any amount is exempt from or not liable to tax; where the court is not so persuaded, the income must be included in gross income; (5) The test for determining whether a receipt constitutes revenue is whether it was a gain made by an operation of business in carrying out a scheme for profit-making, meaning it was not fortuitous but designedly sought and worked for, while recognizing that profit-making is also an element of capital accumulation.