though there was no intention to manufacture the product B, the product B would be called a by-product. The waste is a by-product which is of no value or very low value. Larger Bench of the Tribunal in the case of Markfed Vanaspati & Allied Indus v. CCE, Chandigarh reported in 2000 (116) E.L.T. 204 (Tribunal) after observing that by-product means something of value produced in making the main product or a substance obtained in course of a specific process but not a primary object, has held that the spent earth arising in course of refining of oil, being of no value, is not a new product or a by-product. Though the Tribunal in the case of CCE, Hyderabad v. Priyanka Refineries Ltd. (supra) has held that soap stock arising in course of refining of oil is waste, no reasons have been given for arriving at this conclusion. In this order, the observations of the Tribunal that the decision of Hon’ble Supreme Court in the case of Khandelwal Metal & Engineering Works v. Union of India reported in 1985 (20) E.L.T. 222 (S.C.) would cover the issue in favour of the respondent are also not correct as the issue involved in the case of Khandelwal Metal & Engineering Works was as to whether the imported brass scrap in form of old and used articles of brass sold as scrap, would attract additional custom duty under Section 3 of the Indian Customs Tariff Act, while the issue involved in the case of CCE, Hyderabad v. Priyanka Refineries Ltd. (supra) was as to whether the soap stock arising in course of refining of crude vegetable oil could be treated as waste for the purpose of Notification No. 85/95-C.E., which is a totally different issue. Just because the appeal filed by the Government against this order of the Tribunal has been dismissed by Hon’ble Supreme Court, the dismissal being a summary dismissal without giving any reasons does not lay down any law as, as held by Hon’ble Supreme Court in a series of judgment in the cases of Goodyear India Ltd. v. State of Haryana reported in 1990 AIR SC 781 and A-One Granite v. State of U.P. reported in 2001 AIR SC 848 summary dismissal of an appeal or a SLP without giving any reasons i.e. a sub silentio decision, does not lay down any law or a binding precedent. When a product emerges as a by-product in course of manufacture of some other product, that by-product cannot be treated as waste just because it is an unintended product