Tlou Energy Ltd (LON:TLOU) shares shot up 26% after unveiling a huge increase in reserves at the Lesedi and Mamba coal bed methane projects in Botswana.
Proved and probable reserves (2P) jumped 944% to 40.8 billion cubic feet (BCF) 3.9 from BCF, while the less certain 3P category rose by 63% to 426.6BCF from 261.1BCF. Tony Gilby, Tlou's managing director, described it as a 'very significant' upgrade.
Commercial interiors group Havelock Europa plc (LON:HVE) advanced 18.5% after it detailed financing proposals which are expected to enable a new strategic plan.
Earlier investors were disappointed by a number of London's bigger names as financial results fell short of market expectations.
Dunelm Group Plc (LON:DNLM) shares slumped around 10% after the homewares retailer's interim results highlighted margin concerns.
"It's proving to be a very tough market out there -we've seen several retailers in the sector fail in recent months and margins are coming under pressure across the board," said Neil Wilson, analyst at ETX Capital.
"Consumer spending is softer of course, but the decline in property market activity is key - the less people move home the less they spend on new furnishings."
Dunelm shares were down 51.5p or 8% changing hands at 597p.
Intercontinental Hotels Group (LON:IHG) dropped 4.5% trading at 4,482p as it revealed that no additional capital would be paid out to investors in 2018 despite reporting stronger than expected 2017 results.
The FTSE 100-listed hotel conglomerate said its full-year operating profit rose by 7% to US$759mln, up from US$707mln a year earlier, and above the US$752.1mln forecast provided by the company.
Mining giant BHP Billiton plc (LON:BLT) delivered what is being described as its strongest half year performance since 2015 - supported by improved commodity prices.
Nonetheless, the miner's bottom line was lower than analyst expectations and as a result the mining giant was a standout casualty in Tuesday's early blue chip deals.
Shortly after the open, BHP lost 48p or 3.07% to change hands at 1,512.6p.
Setting aside BHP's evident 'miss', London Capital Group analyst Jasper Lawler said it was a "bumper" first half for the company.
"It is really a goldilocks time for mining company shareholders," he said in a note.
"The rally in oil and copper prices means revenues have jumped but the cost-base is still drastically down because of cuts made after commodity prices crashed in 2014."
Lawler reckons BHP shares can continue their uptrend towards 1,800p, so long as the price first 'holds above' 1,300p.
Elsewhere, HSBC Holdings was the other (LON:HSBA) and BHP Billiton plc (LON:BLT) were the morning's obvious standouts, as far as corporate news is concerned, with both releasing financial results that missed their marks.
The former, revealed that full year profits more than doubled on another strong performance in Asia but results missed analysts' expectations. Pre-tax profit surged 141% to US$17.2bn in 2017 from US$7.1bn a year earlier when the bank incurred a string of one-off costs, including the sale of its Brazil business.
HSBC dropped 21p or 2.76% in earl deals to trade at 739p.
Orosur Mining Inc (LON:OMI) has intercepted good gold grades in recent drilling on its Anza project in Colombia, which have helped validate its geological model. The company also said it is currently mining through a higher cost area at its San Gregorio mine in Uruguay.
Futura Medical PLC (LON:FUM) has a new finance director, with Angela Hildrith joining the company to replace Derek Martin, who has left the company. Hildrith will join the board as a director and will also be chief operating officer.
Waste-to-Energy specialist PowerHouse Energy Group Plc (LON:PHE) has inked a new deal with Wrightbus Ltd, a company that build innovative hydrogen powered buses. The memorandum of understanding is expected to lead to a definitive deal for a venture with Powerhouse supplying its Distributed Modular Gasification (DMG) system and Wrightbus supplying hydrogen fuel powered buses.
Concepta PLC (LON:CPT) has agreed a deal in China for distribution of the app that accompanies its myLotus fertility aid. Beijing Jiayou (AppInChina) will manage the app on Android systems throughout the country.
ECR Minerals PLC (LON:ECR) has commenced geochemical sampling on its gold exploration licenses in Victoria, in preparation for a drilling campaign that will get underway during the first half of this year. Required consents have already been obtained for drilling on two prospects, Black Cat and the HR3 area.
Mosman Oil And Gas Ltd (LON:MSMN) told investors that a completed prefeasibility study assessing a possible horizontal well project, at the Welch Permian Basin property in Texas, would have "attractive economics" at the current oil price. The company said the wells would have anticipated oil flow rates of 60 to 120 barrels per day, based on data from nearby wells, and a new reserves study is now underway, due in April. Big Pic in February.
Eco Atlantic Oil & Gas Ltd (LON:ECO, CVE:EOG) has acquired minority interests in its Guyana subsidiary so that it is now wholly owned. It cleans up the group's ownership structure, in relation to the potentially high impact exploration venture in which it is partnered with Tullow Oil. Big Pic in June.
Appalachian Basin-focused gas producer Diversified Gas & Oil plc (LON:DGOC) has negotiated a new US$500mln debt facility at less than half the cost of its previous arrangement. The five-year senior secured revolving credit facility has been led by Key Bank and will carry an interest rate of Libor + 2.5%-3.25% compared to Libor + 8.5% currently.